2019高考英语一轮题型练Unit1Lifestyles(含解析)北师大版必修1

百度文库 - 让每个人平等地提升自我

1 Unit 1 Lifestyles

李仕才

一、阅读理解

A

If you want to slow aging, you might want to eat less. This finding is good news---if

you were a mouse. The researchers studied mice, not people.

John Price and other researchers studied two groups of mice. One group was able

to eat as much as it wanted. The researchers limited what the mice in the other group

ate. Their diet had 35 percent fewer calories than the first group of mice.

Price says the mice with the diet restrictions were “more energetic and suffered

fewer disease.” They were not just living longer but seemed to stay younger for a

longer period of time.

The researchers found that fewer calories slow down a natural mechanism in cells

called ribosomes. Price explains that ribosomes are responsible for making important

proteins in the cells. But with fewer calories, they slow down. This gives the cells

more time to repair themselves.

The researchers say ribosomes use from 10 to 20 percent of the cell’s energy to

make those proteins. Price wrote that “because of this, it is impractical to destroy

an entire ribosome” when it starts to break down. However, “repairing individual

parts of the ribosome on a regular basis enables ribosomes to continue producing high

quality proteins for longer than they would otherwise. This top quality production,

in turn, keeps cells and the entire body functioning well.”

Price said, “ribosome is a very complex machine, like a car.” They need “maintenance

to replace the parts that wear out the fastest. When tires wear out,” he explained,

“you don’t throw the whole car away and buy a new one. It costs less to replace the

old tires.”

“Food,” he said, “isn’t just material to be burned---it’s a signal that tells

our body and cells how to respond.” Price said the findings help to explain how exactly

our bodies age. And this may “help us make more educated decisions about what we eat.”

1.What can we know about the mice with limited calories from the study? 百度文库 - 让每个人平等地提升自我

2 A. They can keep healthy easily

B. They need more energy to be active

C. They can look younger than they are

D. They will live a longer life like humans

2.What will happen to ribosomes if there are fewer calories?

A. They will completely break down

B. They make proteins in the cells slowly

C. They will produce high quality proteins more

D. They may need more time to repair themselves

3.Price explained the ribosomes’ role of repairing themselves by _________.

A. telling a story B. listing basic data

C. making comparisons D. experimenting on mice

4.What does the text mainly deal with?

A. Food decides how long you live

B. Can you slow down your aging process?

C. Eating less may help you live longer

D. Should your diet be reduced for your health?

【文章大意】本文是一篇说明文。通过研究实验发现：吃的少会使你长寿。

1.A 【解析】细节理解题。根据第二段中The researchers limited what the mice in the other

group ate. Their diet had 35 percent fewer calories than the first group of mice.的提示可知他们能够很容易保持健康，故选A。

2.B 【解析】细节理解题。根据第四段中The researchers found that fewer

calories slow

down a natural mechanism in cells called ribosomes.的提示可知它们会在细胞中缓慢地产生蛋白质，故选B。

4.C 【解析】主旨大意题。根据第一段首句If you want to slow aging, you might want to

eat less. This finding is good news的提示可知这片名文章的主旨是吃的少会使你长百度文库 - 让每个人平等地提升自我

3 寿，故选C。

B

(2017·石家庄高三调研检测)

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