内容正文:
真题圈英语
同步调研卷
七年级下5E
15.Unit6学情调研
(时间:90分钟满分:60分)
开
名卿
第一部分
本部分共33题,共40分。在每题列出的四个选项中,选出最符合题目要求的一项。
一、
单项填空(每题0.5分,共6分)
从下面各题所给的A、B、C、D四个选项中,选择可以填人空白处的最佳选项。
)1.(期中·北京一零一中学)一Why do you like monkeys?
-Because
are clever and cute.
A.them
B.they
C.their
D.theirs
型
)2.(期末·石景山区)I'm going to the zoo with my sister
January 15th.
It's her birthday.
A.in
B.on
C.at
D.to
)3.(期末·房山区)一
penguins fly like other birds?
-No,but they can swim very fast like fish
数
A.Can
B.Should
星教有
C.Must
D.May
)4.Please don't jump into the river.It's very
A.dangerous
B.different
C.wide
D.brave
)5.
did you go yesterday,John?
-I went to the zoo with my friends.
A.Who
B.When
C.Where
D.How
)6.Giraffes can run fast
they cannot run for a long time.
A.and
B.but
C.or
D.so
警0
H
)7.(期末·昌平区)Last week,I
to Beijing Zoo with my parents and saw
题
the cute pandas.
A.went
B.go
C.will go
D.am going
)8.(期末·东城区)Tigers usually
eat grass.They catch other animals
for food
A.isn't
B.aren't
C.doesn't
D.don't
(
)9.(期中·北京一零一中学)一Mum,Ican't find my cat.Where is it?
-Look!It
on the grass.
A.run
B.runs
C.is running
D.are running
)10.-In the morning,Tina plays sports for one hour.
-That's a good
A.habit
B.question
C.music
D.sport
)11.The environment becomes better and better.
birds are coming back.
A.Hundred
B.Thousand
C.Hundreds
D.Thousands of
)12.The children decide
their school yard this Friday afternoon.
A.clean
B.cleaning
C.to clean
D.cleaned
二、完形填空(每题1分,共8分)
阅读下面的短文,掌握其大意,然后从短文后各题所给的A、B、C、D四个选项中,
选择最佳选项。
(期中·通州区)My mum lives alone and works at a hotel.My work and my two
children make it impossible(不可能的)for me to visit her very often..One day,on her
way home from work,she sees a 13.It is very small and has white and black hair.At
first,my mum just walks 14 because it is a really windy evening and it is very dark.
But the cat follows(跟随)my mum a long way..It seems very hungry(饥饿的)andI5.
At last my mum stops and it walks into my mum's heart and life.
A month later,I go to 16_my mum.She tells me excitedly(兴奋地)about her
little cat.I see it for the first time.It is 17 for us to become friends.When I just sit
down on the sofa,it jumps up onto my lap (and touches my hands with its head.
When I call its name,it looks at me with its big eyes and says"miaow"to me.It is so cute
that I love it right away.
This cat makes my mum laugh.She is always happy with the cat around.She cares
about it very much and 18 it fish all the time.The cat will stay in the room when it
feels cold or just doesn't want to be outside.My mum loves it and always tries to make it
feel comfortable ()The cat loves my mum,too.It must think of my mum as its
mum.It is really attached to (her.It makes her 19 full of love and happiness.It
also makes me happy because I love to 20 the smile in my mum's eyes.
)13.A.dog
B.bird
C.cat
D.cow
7
)14.A.happily
B.quickly
C.early
D.safely
(
)15.A.hot
B.cold
C.bored
D.busy
)16.A.welcome
B.miss
C.join
D.visit
)17.A.easy
B.difficult
C.important
D.dangerous
)18.A.gives
B.draws
C.eats
D.receives
)19.A.work
B.story
C.life
D.hotel
)20.A.send
B.put
C.bring
D.see
三、阅读理解(每题2分,共26分)
(一)信息匹配。下面的材料介绍了不同的动物,请为Julie、Frank以及Alan选择
最适合的宠物,并将A、B、C、D选项填在相应位置上。选项中有一项为多余选项。
A
A
B
There is a small rabbit for you!It's
Do you like beautiful pets?If
very cute and it can dance to music.I'm
you say“Yesl”,just come to see the
sure you'll have a good time with it!
red parrot(鹦鹉)!It is small but it
can sing songs,and it is only 40 yuan
c
D
The small fish is now on sale
The black and white dog is
(打折出售).It's easy to keep.You
very smart and friendly.It can do
just need to make it live in clean
something for you.It can walk on
water every day.It doesn't make
two legs,too.
any noise.
21.
Julie wants to have a small and cute pet.She is a little lazy so she hopes it's
easy to keep.And she would like a quiet pet.
22.
Frank wants a smart pet.It can know what he wants it to do.It can also walk
on two legs.And he wants to walk it in his free time.
23.
Alan wants to keep a pet.His room is small so he would like a small pet.
And it can dance to music.
(二)阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、D四个选项中,
选择最佳选项。
B(期中·北航实验学校)
Snakes are special creatures in China.For over 100 million years,snakes have lived
on Earth,even before humans existed.In Chinese stories,they are called "little dragons"
because they are brave,wise,and strong.
In ancient tales,snakes are magical helpers.People believed they could bring good
luck and protect homes from harm.A famous story,The Legend of the White Snake,tells
of a kind snake spirit who helps humans with her wisdom.For example,she once saved
a village from a terrible flood by using her magic powers.Snakes also appear in festivals
like the Spring Festival,symbolizing happiness,growth,and new beginnings.During this
festival,families hang snake decorations on doors to scare away bad luck and welcome
good fortune.
Snakes shed their skin several times a year.This reminds people of growth and hope,
just like how a caterpillar becomes a butterfly.In Chinese art,snakes are often drawn with
flowers or trees to show the connection between nature and life.Long ago,artists drew
snakes with cicadas(insects that also shed skin)to teach about life's cycle of renewal.
This tradition continues today in some rural areas,where people believe snake patterns can
protect farms from drought.
Snakes teach us to respect nature's wisdom.Snakes also remind us that even small
creatures can teach us big lessons.By studying snakes,we learn to protect the environment
and live in harmony with all living things.
()24.What do snake decorations symbolize during the Spring Festival?
A.Keep away bad luck and bring good fortune.
B.Show snake wisdom and harmony in stories.
C.Teach that snakes only exist in old stories.
D.Protect farms from harm and dangers.
)25.What is the main idea of the third paragraph?
A.Snakes are so feared for their poison.
B.Snakes help farmers grow some crops.
C.Snakes'skin-shedding means new life.
D.Snakes only live in ancient times.
(
)26.What is the main message of the passage?
A.Scientists focus on snake behaviour studies.
B.Snake symbols are mainly in old stories.
C.Snakes are dangerous and should be avoided.
D.Our culture values snake wisdom and harmony.
C(期末·延庆区)
A Big Day to Be a Bee
狗
Many people are afraid of bees.However,bees are very interesting animals.They are
加
抑
very hard-working.Of course,bees make delicious honey.But do you know that they keep
us all alive?
州
Every year on May 20,it's World Bee Day.It's a day to thank bees
名肌
for all they do.Without bees,we wouldn't have any food!When bees fly
from one plant to another,they carry pollen.The pollen makes new plants
grow.Bees not only help flowers grow but also help fruit and vegetables
pollen
grow.It's said that at least 90 kinds of plants including nuts,fruits and vegetables depend
on bees for pollination.
It's also a day to learn more about the problems bees are facing.Loss of natural
habitat,getting sick from chemicals (used on crops,and higher temperatures
with climate change are making the number of bees become smaller,said the Food and
翠
Agriculture Organization of the United Nations.
In the last eight years,a lot of bees have disappeared.Scientists have been studying
why those bees have been leaving their hives and not returning.They believe that their
living environment may be changing.Now people are looking to technology (to help
save the bees.One example is the robotic bee project called RoboRoyale.The European
h
Commission funds()it.The project makes robot bees to help feed and look after the
queen bee.This will get the queen bee to lay more eggs and make more bees.
)27.How can bees help plants grow?
A.They make a lot of honey for plants
B.They help plants make more pollen.
C.They bring a special chemical to plants.
D.They carry pollen from one plant to another.
)28.What can we learn from Paragraph 3?
A.Bees like high temperatures.
B.Bees may get sick more easily.
巡加
阳删
C.There are fewer bees than before.D.There are problems with studying bees.
题
)29.Why does the writer give the example of RoboRoyale?
A.To explain why bees are facing a lot of problems.
国
B.To show that technology can help to save the bees.
C.To state that it is easy to look after the queen bee.
D.To introduce how robot bees take care of real bees.
D(期中·北京一零一中学)
Zebra-The Giants of the Animal Kingdom
Hello,young humans.I am a Burchell's zebra(伯切尔斑马),a type of plains zebra
you'll see most often.In fact.I am a herbivore-that is,I eat only grass and plants.The
plains,of course,are flat grasslands.While I'm closely related to the horse and donkey,
we are a different species(物种).
Family
We zebras live in very close-knit family units.Each family has a male,one to six
females,and several young zebras.Families stay together within large herds,which
sometimes have more than a thousand zebras.I live in Botswana(博茨瓦纳),in
southern Africa,but you will find plains zebras in many countries in southern and
eastern Africa.
Cool stripes
We have beautiful black and white stripes,and as well as making us look cool,they
actually keep us cool,too.You see,air moves at different speeds over the black stripes that
absorb light and the white stripes that reflect (light.That means we create our own
cooling air currents to help live under the scorching (sun of the African plain.
How cool is that!
Camouflage(伪装)
拒绝盗
Our stripes also help to camouflage us.They break up the outline ()of our bodies,
so it is difficult to see us,especially in the dawn light when our main predators-lions and
hyenas-are most active.Our stripes also make us appear less attractive to parasites such
as blood-sucking horseflies,which can spread fatal (diseases among herds.
Migration(迁徙)
Zebra migration occurs twice a year in Botswana.In herds of up to 30,000,we move
from the north to the south,and then back again.We travel around 500km each way in
search of fresh grass fields.
()30.According to the article,what can we know about plains zebras?
A.They not only eat grass,but also eat meat sometimes.
B.They are in the same group as horses and donkeys.
C.There are more plains zebras than other kinds.
D.They can live anywhere in the world.
)31.Zebras live in a family unit
A.that has more than a thousand zebras
B.that includes a female,five males and several young zebras
C.where every member has a strong relationship with each other
D.that is quite independent of other families in southern Africa
(
)32.The underlined word"that"(Paragraph 3)refers to that
A.stripes can take in light to keep zebras warm
B.stripes make zebras stand out from other animals
C.stripes of different colours make zebras look fashionable
D.air can move over the stripes to help cool zebras down in hot weather
)33.Stripes can protect zebras by
A.reflecting light to scare away other animals
B.making it difficult for predators to see them
C.attracting parasites such as blood-sucking horseflies
D.spreading diseases to other animals to make them sick
第二部分
本部分共5题,共20分。根据题目要求,完成相应任务。
四、阅读表达(第34-36题每题2分,第37题4分,共10分)
阅读短文,根据短文内容回答问题。
(期末·平谷区)Hello,I'm Dell,an animal
keeper at the National Zoo.My job is to look
after one Sumatran tiger and two Amur tigers.
The Sumatran tiger is small,while the
Amur tiger is large.The Sumatran tiger only
Amur tiger
Sumatran tiger
lives in the islands of Sumatra.It's the smallest of all tigers.Its coat is short with bright colours.
The Amur tiger,the largest living cat in the world,lives in far-eastern Russia and northern
China.It can get very cold there,so the Amur tiger has a very thick coat to keep warm.
Damai is a Sumatran tiger.It is her twelfth year at the zoo.So she knows all the
routines.When she's hungry,she's going to let us know about it.
Nikita,an Amur tiger,reached the zoo in 2019.It took us about two years to build a
good relationship (with her.Metis is another Amur tiger.He often ran out and jumped
into the icy moat to swim!Clearly,he likes the cold water.
Being an animal keeper is not easy,but I love my job.Tigers in the wild are in danger.
Looking after the tigers at the zoo is a good way to help save them.
34.What does Dell do?
35.Where do Amur tigers live?
36.When did Nikita get to the zoo?
37.What do you think of Dell's job?Why?
五、文段表达(10分)
38.(期末·延庆区)根据中文和英文提示,用英文写一篇意思连贯、符合逻辑、不少于
50词的文段。所给提示词语仅供选用。请不要写出你的校名和姓名。开头已给出,
不计入总词数。
动物是人类的好朋友,它们活泼可爱,给人们带来无限欢乐。假如你是李华,
在红星中学学习。请以“My Favourite Animal”为主题,介绍自己喜爱的动物,向校
报投稿。内容包括:你喜爱的动物是什么,它是什么样子的,以及你和它之间发生
的故事。
提示词语:yellow,tall,strong,key,find
提示问题:●What is your favourite animal?
●What does it look like?盗印
.What happened between you and your favourite animal?
I am Li Hua.I study at Hongxing Middle School.答案与解析
28.B根据第三段中“My hometown is also a lively community,
where neighbours greet each other with a smile and lend a helping
hand in times of need.”可知,作者的家乡也是一个热闹的社区,
邻居们微笑着互相问候,并在需要的时候伸出援手,所以作者
家乡的人对彼此都很友好。故选B。
29.C根据倒数第二段中“The local park offers a peaceful place
where I often rest and connect with nature.”可知,作者经常在当
地的公园里休息并享受大自然。故选C。
30.B根据第一段中“but I have learned that it's OK to take time
for ourselves”及全文内容可知,作者用自己的例子说明在忙碌
的生活中为自己留出时间是合理的。故选B。
3l.A根据第三段中“When I was alone,I felt calmer little by little.
This kind of solitude helped me discover deep calmness and
power..”可知,solitude指代前文的“being alone'”的状态,意为
“独处”。故选A。
32.B根据最后一段中“Taking care of ourselves doesn't mean we
are powerless-it's the first step to a happier and more peaceful
1fe.”可推知,作者认为照顾自已(独处)能提升生活质量。故
选B。
33.C通读全文可知,本文通过作者的个人经历,探讨了在快节
奏生活中独处的重要性,并强调平衡社交与独处的必要性。
故选C。
34.It is good for us to have different colours in our diet.
35.Because there are few natural blue foods-it isn't a common natural
food colour and we don't recognize blue food as something
healthy or safe to eat.
36.The writer made some bread with blue colouring and asked some
friends to eat it.
37.No,I wouldn't like to do that.Because blue food looks not safe
or healthy.(答案不唯一,合理即可)
38.Possible versions:
题目①
A Story from My Childhood
I want to talk about a story about a bird when I was in
Grade Three.During that summer vacation,I spent some time
at my grandma's home in a village.One day,I saw a baby bird
fall from a tree.I carefully picked it up and took it home.During
the next few days,I looked after the bird with great care.I even
woke up at midnight to make sure it was okay.A week later,the
bird got much better.And finally,it flew away!
After saving the bird,I felt so proud of myself.
题目②
Hi,Jack!
I'm very glad to hear that you will come to China.I am going to
show you around Beijing,because there are so many places of
interest here.We are going to visit the Summer Palace.We can
go there by subway.We will take a boat to enjoy the beautiful
scenery.And we will walk around the palace.We can see many
old buildings,and we will listen to the introductions to learn
about their history.
I hope you will like it.
Li Hua
15.Unit6学情调研
答案速查
1-5 BBAAC 6-10 BADCA
11-15 DCCBB
16-20 DAACD
21-25 CDAAC
26-30 DDCBC
31-33CDB
1.B空格处指代前一句中的monkeys,且在句中作主语,应用代
词的主格形式。故选B。
2.Bin用于年、月、季节前;on用于具体的某一天或者具体某
一天的上午、下午、晚上前;at用于具体的钟点前;to朝,向。
January15th(1月15日)是具体的某一天,要用on。故选B。
3.Acan能,可以;should应该;must必须;may可能。根据“but
they can swim very fast like fish”可知,问句是问“企鹅能像其他
鸟一样飞吗?”。故选A。
4.A dangerous危险的;different不同的;wide宽的;brave勇敢的。
根据“don't jump into the river'”可知,跳进河里很危险。故选A。
5.C根据“I went to the zoo with my friends.”可知,间句提问地点。
故选C。
6.B“Giraffes can run fast'”和“they cannot run for a long time”之
间是转折关系,应用but连接。故选B。
7.A根据Last week可知,句子时态应用一般过去时。故选A。
&.D设空处后面是实义动词eat,其前不用be动词,排除A、B
两项;主语Tigers为复数名词,助动词用don't,不用doesn't,排
除C项。故选D。
9.C根据“LOok!”可知,句子时态应用现在进行时,主语是It。
故选C。
10.A habit习惯;question问题;music音乐;sport运动。根据常
识可知,早上做运动是一个好习惯。故选A。
ll.D hundred和thousand前有具体数字时,用其单数形式;其前
没有具体数字时,用其复数形式,且其后加of。故选D。
12.C decide to do sth意为“决定做某事”,为固定短语。故选C。
13.Cdog狗;bird鸟;cat猫;cow奶牛。根据“But the cat follows
(跟随)my mum a long way.”可知,作者的妈妈看见了一只猫。
故选C。
14.B happily开心地;quickly迅速地;early早地;safely安全地。
根据“because it is a really windy evening and it is very dark”可
知,有风且很黑,所以走得很快。故选B。
15.Bhot热的;cold冷的;bored无聊的;busy忙碌的。根据“it
is a really windy evening”可知,这只猫又饿又冷。故选B。
l6.D welcome欢迎;miss思念,错过;join参加;visit看望。根据
“My mum lives alone and works at a hotel..”可知,妈妈一个人住,
所以是去看望妈妈。故选D。
17.A easy容易的;difficult困难的;important重要的;dangerous
危险的。根据“When I just sit down on the sofa,.it jumps up onto
my lap(大腿)and touches my hands with its head.”可知,“我”
刚坐在沙发上,它就跳上“我”的腿,用它的头碰“我”的手。
所以“我们”很容易成了朋友。故选A。
18.A根据“fish”可知,妈妈给猫吃鱼。故选A。
19.C work作品,工作;story故事;life生活,生命;hotel旅馆。
根据“full of love and happiness'”可知,这只猫使妈妈的生活充
满爱和幸福。故选C。
20.D send发送;put放;bring带来;see看见。根据“the smile
in my mum's eyes'”可知,“我”喜欢看到妈妈眼中的微笑。故
选D。
2l.C根据“Julie wants to have a small and cute pet.She is a little lazy
so she hopes it's easy to keep.And she would like a quiet pet."
可知,Julie想要一只小巧可爱的宠物,她希望它很好养而且
安静。结合备选项可知,C项“小鱼现在打折出售。它很容
易饲养。你仅需要让它每天生活在干净的水里。它不会发
出任何噪声。”与之匹配。故选C。
22.D根据“Frank wants a smart pet.It can know what he wants
it to do.It can also walk on two legs.And he wants to walk it
in his free time.”可知,Frank想要一只聪明的宠物。它能知道
他想让它做什么。它还能用两条腿走路。结合备选项可知,
D项“那只黑白相间的狗很聪明、友好。它可以为你做一些事。
它也可以用两条腿走路。”与之匹配。故选D。
23.A根据“Alan wants to keep a pet.His room is small so he would
like a small pet..And it can dance to music..”可知,Alan想养一只
小宠物。它还能随着音乐跳舞。结合备选项可知,A项“这
儿有一只小兔子给你!它很可爱,它可以跟着音乐跳舞。我
确信你和它在一起会很开心。”与之匹配。故选A。
24.A根据第二段中“Snakes also appear in festivals like the Spring
Festival,symbolizing happiness,growth,and new beginnings.
During this festival,families hang snake decorations on doors to
scare away bad luck and welcome good fortune.”可知,蛇装饰在
春节期间的寓意是驱除厄运并带来好运。故选A。
25.C根据第三段中“Snakes shed their skin several times a year..
This reminds people of growth and hope,just like how a
caterpillar becomes a butterfly.”可知,第三段主要讲了蛇蜕皮
象征着新生和希望。故选C。
26.D根据最后一段中“Snakes teach us to respect nature's wisdom
Snakes also remind us that even small creatures can teach us big
lessons.”可知,文章的主旨是蛇的智慧和和谐在中国文化中受
到重视。故选D。
27.D根据第二段中“When bees fly from one plant to another,
they carry pollen.The pollen makes new plants grow.”可知,当
蜜蜂从一株植物飞到另一株植物时,它们会携带花粉。花粉
使新植物生长。故选D。
28.C根据第三段中“Loss of natural habitat,,getting sick from
chemicals(化学品)used on crops,and higher temperatures with
climate change are making the number of bees become smaller"
可知,自然栖息地的丧失、农作物上使用的化学物质导致的疾
病以及气候变化导致的气温升高,都使蜜蜂的数量变得越来
越少。故选C。
29.B根据最后一段中“Now people are looking to technology(科
技)to help save the bees..”和“The project makes robot bees to
help feed and look after the queen bee.This will get the queen bee to
lay more eggs and make more bees..”可知,作者s列举RoboRoyale
的例子是为了展示科技可以拯救蜜蜂。故选B。
30.C根据第一段中“Hello,young humans..I am a Burchell's zebra
(伯切尔斑马),a type of plains zebra you'll see most often.”可
知,平原斑马的数量比其他种类的斑马多。故选C。
31.C根据第二段中“We zebras live in very close-.knit family units.
Each family has a male,five or six females,and several young
zebras.Families stay together within large herds,which sometimes
have more than a thousand zebras.”可知,斑马生活在一个紧密
的家庭单位中,每个家庭都有一个雄性,五到六个雌性和几个
小斑马。各个家庭会聚集在庞大的群体中生活,这些群体有
时有超过一千只斑马。C选项“(斑马生活的家庭单位中)每
个成员之间都有很紧密的关系”符合题意。故选C。
真题圈英语七年级下5E
32.D根据第三段中“You see,air moves at different speeds over
the black stripes that absorb light and the white stripes that reflect
(light.That means we create our own cooling air currents
to help live under the scorching(炽热的)sun of the African
plain.”可知,that指的是空气可以在条纹上移动以帮助斑马在
炎热的天气下降温。故选D。
33.B根据第四段中“Our stripes also help to camouflage us.They
break up the outline (of our bodies,so it is difficult to see
us,especially in the dawn light when our main predators-lions
and hyenas-一are most active.”可知,条纹可以通过使捕食者难
以看到它们来保护斑马。故选B。
34.He is an animal keeper.
35.They live in far-eastern Russia and northern China.
36.In2019.
37.Dell's job is important.Because he protects the wild animals.
案不唯一,合理即可)
38.One possible version:
I am Li Hua.I study at Hongxing Middle School.I want to
introduce my favourite animal to you.
My favourite animal is a dog.Its name is Wangwang.It is a
yellow one.It is tall and strong.
Last Sunday,I went to the park with it.We had a good time
near the lake.When I decided to go home,I couldn't find my key.
I was very worried.At last,my dog helped me find the key.What
a helpful dog!
16.Unit6阅读素养提优
L.D follow跟随;catch抓住;see看见;touch触碰。根据“His
neck went up into the blue sky,and it almost...the clouds.”可知,
长颈鹿脖子很长,几乎碰到云朵。故选D。
2.C walk走;un跑;fly飞;jump跳。根据“I imagined climbing
on the top of him.In my mind,I felt like I was...through the air!"
知,作者想象爬到长颈鹿顶上,结合“through the air”可知,在空中
的状态更像是“飞翔”。故选C。
3.A head头;hand手;shoulder肩膀;leg腿。根据“When I told my
mother this idea,she shook her..”可知,“shake one's head”是固
定表达,表示“摇头”,这里妈妈不同意作者的想法,所以摇头。
故选A。
4.C interesting有趣的;funny滑稽的;dangerous危险的;difficult
困难的。根据“Itis..for little kids to go climbing on roofs.”可知,
妈妈以爬上屋顶危险为由拒绝作者带长颈鹿回家。故选C。
5.B nervously紧张地;sadly难过地;calmly平静地;excitedly兴
奋地。根据“I breathed out...as we left the zoo,and I left my pet
giraffe behind forever.”可知,作者不能带走长颈鹿,心情是难过
的。故选B。
6.D wave挥手;dance跳舞;face脸;sound声音。根据“He looked
up at me and made a happy..like music to my ears..”可知,仓鼠发
出“声音”,“make a sound'”是常见表达。故选D。
7.A lift举起;throw扔;bring带来;pull拉。根据“Although I could
not ride on his back,I could...him up in my hand so that he felt like
he was flying through the air!”可知,“lift..up”表示“举起.”,
这里说用手举起仓鼠。故选A。
8.B success成功;surprise惊喜;change改变;lesson教训。根据
“What a wonderful.!”及上文“父母给作者准备了小仓鼠作为
宠物”可知,这对孩子来说是一个“惊喜”。故选B。