Unit5 Working the land单元复习训练--2020-2021学年人教版（2019）英语选择性必修第一册

Unit 5　Working the land单元复习训练

Ⅰ.单句填空

1.It isn’t a subject 　　　　which I devote a great deal of thought. 

2.Because of the hurricane, that country is suffering from food　　　　(short). 

3.The boss gave the staff a pep talk this morning in an attempt 　　　　(boost) sales. 

4.Scientists say there is no 　　　　(convince) evidence to prove that. 

5.People still wore their hair short and dressed 　　　　(convention). 

6.The fast-food business is 　　　　(intense) competitive. 

7.Pompeii, buried under the ashes, was 　　　　(entire) forgotten by the world.  

8.My old clothes are a witness to my 　　　　(poor). 

9.The bank plans various 　　　　(extension) in different neighbours. 

10.Unfortunately a big nose is a family 　　　　(character) for her.  

Ⅱ.阅读理解

Is it worth buying organic food?

 Organic food, grown without artificial chemicals, is increasingly popular nowadays. Consumers have been willing to pay up to twice more for goods with organic labels (商标). However, if you think paying a little more for organic food gets you a more nutritious and safer product, you might want to save your money. A study led by researchers at Stanford University says that organic products aren’t necessarily more nutritious, and they’re no less likely to suffer from disease-causing bacteria, either.

The latest results, published in Annuals of Internal Medicine, suggest that buyers may be wasting their money. “We didn’t find strong evidence that organic food is more nutritious or healthier,” says Dr Crystal Smith-Spangler from Stanford. “So consumers shouldn’t assume that one type of food has a lower risk or is safer.”

For their new study, Smith-Spangler and her colleagues conducted a review of two categories of research, including 17 studies that compared health outcomes between

consumers of organic against traditional food products, and 223 studies that analysed the nutritional content of the foods, including key vitamins, minerals and fats.

While the researchers found little difference in nutritional content, they did find that organic fruit and vegetables were 20% less likely to have chemicals remaining on the surfaces. Neither organic nor traditional foods showed levels of chemicals high enough to go beyond food safety standards. And both organic and traditional meats, such as chicken and pork, were equally likely to be harmed by bacteria at very low rates. The researchers did find that organic milk and chicken contained higher levels of omega-3 fatty acids, a healthy fat also found in fish that can reduce the risk of heart disease. However, these nutritional differences were too small, and the researchers were unwilling to make much of them until further studies confirm the trends.

Organic food is produced with fewer chemicals and more natural-growing practices, but that doesn’t always translate into a more nutritious or healthier product. The US Department of Agriculture (USDA) states that “Whether you buy organic food or not, finding the freshest foods available may have the biggest effect on taste.” Fresh food is at least as good as anything marketed as organic.

(　　)1.The new research questions whether organic food 　　　　. 

A.should replace traditional food

B.has been overpriced by farmers

C.is grown with less harmful chemicals

D.is really more nutritious and healthier

(　　)2.Smith-Spangler and her colleagues found that 　　　　. 

A.organic food could reduce the risk of heart disease

B.traditional food was grown with more natural methods

C.both organic food and traditional food they examined were safe

D.there was not the presence of any forms of bacteria in organic food

(　　)3.Which of the following are healthier according to the passage?

A.Organic chicken and pork.

B.Organic milk and chicken.

C.Traditional chicken and pork.

D.Traditional fruit and vegetables.

(　　)4.What is the author’s attitude towards organic food?

A.Sceptical.  

B.Neutral.

C.Unconcerned.  

D.Approving.

Ⅲ.完形填空

Once a little boy found a caterpillar(蝴蝶幼虫). After he was allowed to  　1　  it at home, the little boy got a large box from his mother and put plants to eat, and a stick to climb on. One day the caterpillar climbed up the stick and started acting  　2　. The boy worriedly called his mother who came and understood that the caterpillar was creating a cocoon(茧). The mother  　3　  how the caterpillar was going to go through a change and become a butterfly.  

The little boy watched every day,  　4　  the coming out of the butterfly. One day it happened that a small hole  　5　  in the cocoon and the butterfly started to struggle to come out. At first the boy was  　6　, but soon he became concerned. The butterfly was struggling so hard. But it looked like it was making no  　7　. Longing to see it out, the boy decided to help. He cut the cocoon with scissors to make the hole  　8　  and the butterfly quickly flew out!  

To his  　9　, the butterfly had an unexpectedly large body and small wings. He  　10　  to watch the butterfly, hoping that the wings would dry out, enlarge and expand to support the huge body. But nothing happened! It never was able to  　11　.  

The boy tried to find out what had gone wrong. To help him, his mother took him to talk to a scientist. He  　12　  that the butterfly was supposed to struggle. Without the struggle, the butterfly would never fly. The boy’s good wish  　13　  the butterfly.