2021届高考核心考点十分钟基础题速练：单句改错+阅读理解

2021届高考核心考点十分钟基础题速练：单句改错＋阅读理解

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Ⅰ.单句改错(定语从句和状语从句)

1．Before I could say anything, she smiled at me and said she wanted to take me to another place where was special to her.________________

2．But there are some among us which are ready to give up when they come to a hard example in mathematics.________________

3．The original hamburger can be traced back to the middle ages, which Russians ate raw meat that was cut into small pieces and formed into a small round flat shape.________________

4．I led them to the nearby bus stop and told them to take Bus No. 305, that could take them there directly.________________

5．There was a time while misunderstanding occured between my friend and me, and we quarreled terribly at that time.________________

6．He told me that my goldfish would die though they couldn't adapt to the environment in the wild.________________ 7．I didn't begin to like our houseparents when something happened one night.________________

8．It is a long time since they separated, but it won't be long when they meet again.________________

9．He said, “I was in the kitchen with my wife and children while we heard a loud noise.”________________ 10．You shouldn't spend your time in playing computer games even you have finished your homework.________________

Ⅱ.阅读理解

A

feel that way is that coffee contains caffeine (咖啡因). Caffeine occurs naturally in coffee, tea, and cocoa beans, which are used to make chocolate. But now food makers are adding it to many products, from potato chips to water.

The U. S. government is especially worried about the problem. That's why the Food and Drug Administration (FDA) is studying the health effects of caffeine on young people. Studies show that too much caffeine can make people nervous and unable to sleep. What's more, caffeine is habit-forming. Those who consume it regularly and stop suddenly may experience headaches and feel tired.

One of the biggest concerns is the large amount of caffeine added to so-called energy drinks, like Red Bull. A 12-ounce can of cola has about 35 milligrams of caffeine. A similar serving of Red Bull contains more than three times that amount.

The Institute of Medicine is also working on caffeine-safety measures. “Teenagers should not drink beverages that contain caffeine. They should be aware of caffeine's effects on health and on how the brain works. Take, for example, teenagers who consume caffeine to stay awake and study for a test. They will remember less of what they have just studied，” said Stallings, a member of the institute.

Companies that make products with added caffeine claim they do not advertise them to teenagers. However, there is no law to stop teenagers from buying them. So the FDA needs to set limits on caffeine, especially in energy drinks. As for added caffeine in food, the government should just say no. If not, the amount of caffeine should be printed on food labels to remind consumers. The government must do that.

Doctors say teenagers should avoid caffeine. If you need extra energy, try these natural boosters: eat right, exercise, and get plenty of sleep.

1．What is the U．S. government particularly concerned about?

A．The fact that coffee contains caffeine. B．The practice of adding caffeine to food.

C．The measures of avoiding caffeine's effects. D．The practice of using caffeine to make chocolate.

2．Why is Red Bull mentioned in Paragraph 3?

A．To show us caffeine's effects on health. B．To tell us about teenagers' addiction to caffeine.

C．To show a drink which contains much caffeine. D．To show people's concern about teenagers' health.

3．What is Paragraph 5 mainly about?

A．The measures of protecting teenagers from caffeine's effects.

B．The process of the government's controlling the use of caffeine.

C．The government's responsibility of taking care of teenagers.

D．The risk of buying products containing caffeine nowadays.

4．The author may agree that ________.

A．headaches and feeling tired are common in teenagers