内容正文:
How Do Scientists Tell the Age of Animals?
课堂练习
I.Complete the sentences.
1.Itis
for scientists to know how many animals there are and how old they are
2.For some animals,their teeth don't
until a certain age.
II.Complete the table.
How do scientists tell the age of animals?
he reason to
It can help scientists know which animals are thriving and which ones
know animals'age
need more(1)
Seeing their teeth.For example,cows get their first pair of permanent
teeth at age(2)
and have the next pair at age three.
Ways to tell
Seeing their hair and skin.For example,dogs'noses and mouths
animals'age
(3)】
as they get older.
Checking their eyes and ears.As animals get older,their hearing
often becomes weak and their eyesight might begin to(4)
Examining their DNA.
课后练习
I.Complete each sentence with one word in its proper form.
certain,provide,eyesight,examine
1.We
food for the hungry children in the last few days.
2.People who smoke cannot travel in
parts of the train.
3.The doctor
her carefully yesterday.
4.Reading in poor light can damage your
II.Translate the following sentences with the given phrases from the article.
L.直到秋天他们才再次见面。(not..ntil)
2.健身房在六点左右往往很忙。(tend to)
写作练习
学完本文后,我们己经知道主要从哪几个方面来判断动物的年龄。请同学们在课后写
一篇不少于80词的英语作文来介绍自己最喜欢的动物。(可以从所属物种、名字、产
地、现居住地、年龄、生日、外貌、性情以及生活习性等方面入手介绍)
答案:
课堂练习
I
1.important
2.come in
Ⅱ
(1)care and help
(2)two
(3)get grayer
(4)fail
课后练习
I
1.provided
2.certain
3.examined
4.eyesight
Ⅱ.
1.They didn't see each other again until the fall.
2.The gym tends to be very busy at around six o'clock.
写作练习
My favorite animal is a panda.Its name is Hefeng.It's from Sichuan,China.Now it
lives in Shanghai Zoo.It is seven years old,and its birthday is on August 9th.It's black and
white,and there is a pinch of white hair on two of its feet.It looks very cute and it's very
lively.It loves to eat bamboo.It sometimes plays with its friend after eating
In short,it is my favorite animal.As a symbol of peace and friendship,we must do our
best to protect pandas and thei