Some people fear that ________ air pollution ...

Some people fear that ________ air pollution may bring about changes in ________ weather around the world .

A. / ; the        B. the ; /        C. an ; the       D. the ; a

高三英语单项填空中等难度题查看答案及解析

Some people fear that ________ air pollution may bring about changes in ________ weather around the world.(2009·江西)

A．/；the　 B．the；/　 C．an；the　 D．the；a

高三英语单项填空中等难度题查看答案及解析

Some people fear that ________ air pollution may bring about changes in _______ weather around the world.

A. /; the       B. the; /       C. an; the        D. the; a

高三英语单项填空中等难度题查看答案及解析

Some people fear that ________ air pollution may bring about changes in _______ weather around the world.

A. /; the       B. the; /       C. an; the        D. the; a

高三英语单项填空中等难度题查看答案及解析

Some people fear that ________ air pollution may bring about changes in _______ weather around the world.

A. /; the       B. the; /       C. an; the        D. the; a

高三英语单项填空中等难度题查看答案及解析

Some of the people often ask the same question　　the air has been polluted.

A. whether    　        B. if            C. that            D. where

高三英语单项填空中等难度题查看答案及解析

It is only with the help of scientific research _____ bring PM1 air pollution under control.

A. that we will　　　　 B. we will　　　　　

C. that we do　　　　　 D. do we

高三英语单项填空中等难度题查看答案及解析

B vitamins（维生素）may offer some protection against the effect of air pollution,a new study suggests.

The scientists say the effect is real but stress the limitations of their work.Follow-up studies are urgently needed, they say,in heavily polluted cities like Mexico.

According to the World Health Organization (WHO),over 90% of the world's population live in heavily-polluted areas.The one of the pollutants that is considered the most dangerous is very fine particulate matter, referred to as PM2.5.At around 1/30 the width of a human hair,PM2.5 can go deep into the human lung and contribute to lung and heart health problems in the young and old.

Scientists have long suspected that PM2.5 causes what are termed epigenetic（表观遗传）changes in our cells that can damage our health.Now in this new human trial,an international team of scientists wanted to see if exposure to concentrations of PM2.5 could be mitigated by daily B vitamins.

Ten volunteers were tested initially exposed to clean air and their basic responses were measured.The same volunteers were later tested with large doses（剂量）of B vitamins while exposed to air containing high levels of PM2.5.The researchers found that a four-week B vitamin intake limited the PM2.5 effect by between 28-76% at ten gene locations.They found a similar reduction in effect on the mitochondrial DNA,the parts of cells that produce energy.

However,the researchers caution that their study,while observing a real effect,has limitations.As well as the small number of participants,there was little information on the size of the B vitamin dose that caused the response.

1.What is the main idea of the text?

A. B vitamins may fight against PM2.5.

B. PM2.5 can lead to epigenetic changes.

C. Further studies should be done on PM2.5.

D. Exposure to PM2.5 is more and more serious.

2.Which can replace the underlined word "mitigated" in Paragraph 4?

A. measured　　 B. ignored

C. reduced　　 D. observed

3.How many limitations does the text mention about the new study?

A. 2.　　 B. 3.

C. 4.　　 D. 5.

4.How does the writer of the text like the new study?

A. He believes it deeply.　　 B. He criticizes it strongly.

C. He thinks it needs testing again.　　 D. He shows no opinion about it.

高三英语阅读理解困难题查看答案及解析

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Scientists found that air pollution may be responsible 1. a significant reduction in intelligence. The research conducted by the World Health Organization ( WHO ) in China 2. (show) that air pollution led to big falls in test 3. (score) for languages and arithmetic. The study is called “The impact of exposure to air pollution on cognitive (认知的）performance ”. It was published in the Proceedings of the National Academy of Sciences journal. The study took place over four years. Researchers analyzed speaking and arithmetic tests taken by 20 000 people of all ages. They said， “Polluted air may prevent cognitive ability 4. people become older.”

The study is a warning to the rest of the world, 5. (especial) to those in cities. Over 91 percent of the world population live in areas with 6. (poison) air and air pollution is the 7. (four) highest cause of global deaths. Researchers discovered that 8. longer people were exposed to polluted air，the greater their intelligence went down. They said air pollution caused a year’s worth of lost education. For those 9. were over 60 years old，this could be several years. A researcher warned，“There is no shortcut 10. (solve) this issue. Governments really need to take effective measures to reduce air pollution.”

高三英语语法填空中等难度题查看答案及解析

阅读下面材料，在空白处填入1个适当单词的或括号内单词的正确形式。

Scientists found that air pollution may be responsible 1. a big reduction in 2. (intelligent). Research showed that air pollution led to big falls in test 3. (score) for languages and mathematics. The study called "The influence of air pollution on cognitive (认知的)performance"4.(conduct) over four years ago. Researchers analyzed speaking and mathematics tests 5. (take) by 20,000 people of all ages. They said, "Polluted air may do harm to cognitive ability as people become older. "

The study is a warning to the rest of the world ,6.(particular) those in cities. Over 91 percent of the world population live in areas with polluted air,7. is the fourth biggest cause of global deaths. Researchers discovered that the 8.(long) people were exposed to polluted air, the greater their cognitive ability went down. They said air pollution caused a year' s worth of lost education. For those aged over 60, this could be several years. A researcher warned, "There 9.be) no shortcut to solve this issue. Governments really need to take effective measures 10.(reduce) air pollution. "

高三英语语法填空中等难度题查看答案及解析