Experts believe that land that is becoming de...

Experts believe that land that is becoming deserts ________ the size of Australia, Russia and the United States put together

高三英语单项填空简单题查看答案及解析

Some experts have said that ________ children believe they can succeed, they will never become totally confident of themselves.

A．if　     B．since

C．once     D．unless

高三英语单项填空中等难度题查看答案及解析

China has developed a technology that is able to transform desert lands into available soil. The technology 1. (develop) several years ago by researchers at Chongqing Jiaotong University. They invented a paste(黏合剂)2. (make) of a material found in plant cell walls that, when mixed 3. sand, is able to keep water, nutrients, and air.

According to CGTN, Chinese scientists have achieved success in growing crops in areas with bad conditions caused by lack of rain and 4. (extreme) hot temperatures. One particular area is in a desert in North China’s Inner Mongolia. Over 70 kinds of crops are growing there. Many are not planted by humans but they just grow 5. (they) . And the costs of artificial materials and machines for transforming sand into soil is much 6. (low) compared with regular methods. Now, nearly 500 acres of sand is being turned into farms producing corn, 7. (tomato) and sunflowers. A reforestation(重造森林)project is also currently in progress, 8. is set to reforest 50% of desert land in three years.

Researchers are looking into expanding their project this fall, with 9. plan to transform another 500 acres of desert. In the next few years, the scientists are 10. (confidence) that they can turn over 30,000 acres more into rich ground.

高三英语语法填空中等难度题查看答案及解析

Many experts believe that teachers’ development is _______ the key to better education lies.

A. that                        B. what                       C. where                    D. which

高三英语单项填空中等难度题查看答案及解析

Experts believe that language learning is a process ______ skills are more important than grammar rules.

A．whose            B．when             C．of which          D．in which

高三英语单项填空简单题查看答案及解析

It is a mystery that has puzzled doctors for decades. But experts believe they have now finally solved the tricky question of why winter is notoriously known as the flu season.

According to a new research, the influenza virus coats itself in a protective fatty shield that is tough enough to resist cold temperatures. The butter-like material only melts when it hits the respiratory tract（呼吸道）, leaving the virus free to infect cells-- a process scientists say is like an M&M melting in the mouth.

However, in warmer outdoor temperatures, the protective coating melts before it reaches a person or an animal, killing the bacteria before they can infect someone. Joshua Zimmerberg, from the National Institute of Child Health and Human Development (NICHD), in the US, which led the study, said: “Like an M&M in your mouth, the protective covering melts when it enters the respiratory tract. It's only in this liquid period that the virus is able to enter a cell to infect it.”

In the past, scientists worked on theories that flu is more common in winter because people spend more time inside or the radiation from the sun in summer kills off germs. But no research successfully explained the spread of the disease.

Researchers have already claimed that the report, which is published in the journal Nature Chemical Biology, could lead to new ways to prevent and treat flu. “Now that we understand how the flu virus protects itself so that it can spread from person to person, we can work on ways to prevent it.”

Influenza and other respiratory viruses are spread in small drops broadcast by coughing, sneezing and talking and which can also settle onto surfaces, to be picked up on fingertips.

1. What can be the best title of the passage?

A. The mystery that has puzzled doctors for decades.    B. New ways to prevent and treat flu.

C. A discovery of how flu strikes in Winter.            D. Ways found to prevent flu.

2. Which of the following statements is NOT true?

A. Doctors have been trying hard to discover why flu strikes in winter.

B. In the past, scientists didn’t know how flu spreads.

C. It is possible that flu virus will no longer threaten humans in winter.

D. People get affected by flu because they spend much more time inside in winter.

3. Where should you insert the following paragraph into the passage?

Duane Alexander, the director of NICHD, said: “The study results open new avenues of research for thwarting (使…受挫)winter flu outbreaks.”

A. Between Paragraphs 1 and 2.     B. Between Paragraphs 3 and 4.

C. Between Paragraphs 4 and 5.     D. Between the last two paragraphs.

4.In what process or order does flu occur?

a. The virus infects cells                 b. The influenza virus was born

c. The butter-like material melts           d. The virus hits respiratory tract

e. The virus coats itself in butter-like shield  f. The virus is free

A. a, c, d, e, b, f .     B. c, f, d, b, e, a.    C. b, e, d, c, f, a.    D. d, b, e, c, f, a.

高三英语阅读理解简单题查看答案及解析

Health experts believe that even a little exercise is far better than _____at all．

A． none　　　 　 B． nothing

C． no one　　　　 D． anything

高三英语单项填空中等难度题查看答案及解析

Health experts believe that even a little exercise is far better than _____at all.

A. none                B. little                　 C. everything        D. anything

高三英语单项填空中等难度题查看答案及解析

Health experts believe that even a little exercise is far better than _____at all．

A．none    B．nothing

C．no one    D．anything

高三英语单项填空中等难度题查看答案及解析

Health experts believe that even a little exercise is far better than ______ at all.

A. none　　　　 B. little　　　　 C. everything D. anything

高三英语单项填空中等难度题查看答案及解析