This new kind of chemical will help keep the ...

This new kind of chemical will help keep the air, soil and water________ from pollution．

A．empty                 B．loose                C．free              D．short

高三英语单项填空中等难度题查看答案及解析

The soil is becoming poor because farmers here mostly use only one kind of chemical fertilizer for several years________.

A. in a row　　 B. on a large scale

C. at random　　 D. to a degree

高三英语单项填空中等难度题查看答案及解析

Vitamin B could help reduce the effects of the dangerous type of air pollution, according to a new study published on Monday. In the first study of its kind, a team of international researchers looked into the damage caused by one of the pollutants that have the severest impact on health—PM2.5.

They found that Vitamin B supplement could effectively reduce the impact of the tiny particles （颗粒）on the human body, although they stressed that the research was in its early stages. According to the WHO, 92% of the world's people are living in places where the PM2.5 level goes beyond the recommended level. So it’s urgent to find a solution to the problem.

According to this study, published in the PNAS, 10 volunteers were initially exposed to clean air and given a placebo (安慰剂）to check their baseline responses. The group then kept on taking placebos tor tour weeks before being exposed to heavily polluted air from downtown Toronto, where an estimated 1,000 cars passed every hour. The bad air was delivered to the volunteers through an "oxygen type" face mask. The experiment was then repeated, with each volunteer taking a Vitamin B supplement daily, made up of 2.5mg of folic acid, 50mg of Vitamin B6, and l mg of Vitamin B12.

Vitamin B6 can be found in liver, chicken, nuts and other things, and Vitamin B12 in fish, meat, eggs, milk and some cereals. The researchers found that four weeks of Vitamin B supplements — the damage of PM2.5 effects by 28-76%. The results emphasized how prevention at an individual level could be used to fight against the damage of PM2.5, the researchers said.

1.What's the newly discovered effect of Vitamin B in Paragraph 1?

A. It can be used to replace other vitamins in our daily life.

B. It can help lower the air pollution level in the open air.

C. It can reduce the impact of PM2.5 on human bodies.

D. It can get rid of the pollutants remaining in our body.

2.What can be learned from the second paragraph?

A. Further study about the effect of Vitamin B needs to be done.

B. Vitamin B is the most important to human's health.

C. The tiny particles in the air are made up of PM2.5.

D. 92% of the world's people are affected by PM2.5.

3.How did researchers draw the new conclusion about Vitamin B?

A. By referring to a journal.　　 B. By performing experiments.

C. By interviewing scientists.　　 D. By comparing vitamins.

4.You may read the passage on a website about　　 　　　　 .

A. environment　　 B. medicine

C. education　　 D. health

高三英语阅读理解中等难度题查看答案及解析

Scientists have discovered thirteen kinds of vitamins. They say vitamins help to carry out chemical changes within cells. If we do not get enough of the vitamins we need in our food, we are at risk of developing a number of diseases. Which foods should be eaten to keep us healthy? Let us look at some important vitamins.

Vitamin A helps prevent skin and other tissues from becoming dry. People who do not get enough vitamin A cannot see well in darkness. Vitamin A is found in fish liver oil and the yellow part of eggs.

Vitamin B-1 is also called thiamine. Thiamine changes starchy（含淀粉的）foods into energy. Thiamine is found not just in whole grains like brown rice, but also in beans and peas, nuts, and meat and fish.

Vitamin B-12 is needed so folic acid can do its work. Together, they help produce red blood cells. Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy. Vitamin B-12 is found naturally in foods like eggs, meat, fish and milk products. Vitamin B-12 is found in green leafy vegetables and other foods, like legumes and citrus fruits （柑橘类水果).

Vitamin C is needed for strong bones and teeth. The body stores little vitamin C. So we must get it every day in foods such as citrus fruits, tomatoes and uncooked cabbage.

Vitamin D prevents the children’s bone disease rickets （佝偻病）. Ultraviolet light from the sun changes a substance in the skin into vitamin D. Fish liver oil also contains vitamin D.

Vitamin K is needed for healthy blood. It thickens the blood around a cut to stop bleeding. It can also be found in pork products, liver and in vegetables like cabbage, kale and spinach （菠菜）.

Vitamins are important to our health. A lack of required vitamins can lead to health problems.

1.What is the main idea of the passage?

A. There are thirteen kinds of vitamins in total.

B. One can not live without enough vitamins.

C. Vitamins can carry out chemical changes within cells.

D. Enough vitamins are vital to keep healthy.

2.Women who wish to become mothers should take in ________.

A. vitamin A　　 　　 　 B. vitamin B-1

C. vitamin B-12　　　　 D. vitamin C

3.What can change a substance in the skin into vitamin D?

A. Fish liver oil.

B. Ultraviolet light from the sun.

C. Fresh milk drunk by people.

D. Doing a certain amount of exercise.

4.According to the passage, taking in enough vitamin C can ________.

A. make our eyesight better

B. help to stop bleeding

C. make our bones and teeth strong

D. help produce red blood cells

高三英语阅读理解中等难度题查看答案及解析

The animal of this kind is _______; we’d better ________.

高三英语单项填空中等难度题查看答案及解析

STAGE

1.We can learn from the text that.

A. Story of puppets is a play held in China Children’s Theater

B. the artists who have won prizes will perform magic tricks

C. on March 5 there will be two plays for us to choose

D. the artists in the Beijing Peking Opera Troupe are from all over the country

2.If a tourist wants to see a performance on March 15, he can call  to book a ticket.

A. 86531043       B. 65250123     C. 66037255       D. 65071818

3.According to the text, which of the following statements is true?

A. The director of the Story of Puppets combines different operas in it.

B. Green Hat is based on a famous novel acted by some American artists.

C. Top Acrobatic artists will present their performances around our country.

D. The Beijing Peking Opera Troupe will give two performances with the same excerpts.

高三英语阅读理解中等难度题查看答案及解析

Vitamin D helps our bodies make a special chemical，and this special chemical, ______

affects our brains，making us feel happy．

A．in turn          B．in particular         C．in advance         D．in short

高三英语单项填空简单题查看答案及解析

Vitamin D helps our bodies make a special chemical，and this special chemical，

__________，affects our brains，making us feel happy.

A. in turn            B. in particular         C. in advance    D. in short

高三英语单项填空中等难度题查看答案及解析

(2014·烟台市第二次诊断)Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy.

A．in turn　    B．in particular

C．in advance　    D．in short

高三英语单项填空中等难度题查看答案及解析

—This kind of food is said to contain poisonous chemicals.

—So why not _____ it?

A. murder　　　　　 　　　　 B. arrest

C. boycott　　　　 　　　　 D. abolish

高三英语单项填空中等难度题查看答案及解析