题目内容

一What’s the problem with your mountain bike Thomas?

一 _______.I can manage it and catch up with you

A. Not so badB. Nothing serious

C.Good. Thank youD. Never mind

 

B

【解析】

试题分析:考察交际英语。情景交际用语的考查关键在于理解上下文语境,同时要注意辨析选项的意思。平时熟记各种情景下的不同的交际用语,尤其是一些与汉语相差较大的表达。做这类试题,要求同学们按照所给的情景,选择最佳问句或答句,完成题目。要想做好这类题目,关键是平时要养成讲英语的良好习惯,努力提高口语水平,熟练掌握日常会话项目中常用的问答语。A不是很糟糕;B不严重;C好的,谢谢你;D没关系;句义:—你的山地车怎么了?—不严重,我可以自己搞定并追上你。根据第二句后半句可知,山地车的情况并不严重。不是委婉拒绝对方的关心。故B正确。

考点:考察交际英语

 

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The sound of a mosquito can mean trouble in many parts of the world. The bite of the mosquito can be deadly. The insects carry serious diseases like malaria. It is estimated that almost 630,000 people died from malaria and malaria-related causes in 2012, and most of these cases were in African countries.

In the United States, a group of California scientists is working to develop a more effective and less costly substance(物质)to protect people from mosquitoes. The researchers are investigating the sense of smell in mosquitoes. They found the insects use the same receptor(感受器)for identifying carbon dioxide in human breath as they do for the smell of our skin. Anandasankar Ray, who is leading the investigation, says scientists tested more than a million chemical compounds(化合物)until they found a substance called Ethyl pyruvate. He says Ethyl pyruvate makes the mosquitoes' receptor inactive. ”When we apply Ethyl pyruvate to a human arm and offer it to hungry mosquitoes in a cage, very few of the mosquitoes are attracted to the human arm because only a few of them are able to smell it out,” said Ray.

Genevieve Tauxe, a member of the research team, says it was not easy to find the neurons (神经元)of nose cells that recognise both the smell of human breath and skin. "With the device used to examine mosquitoes, we are able to insert a very small electrode(电极)into the part of the mosquitoes' nose, where its smelling neurons are and where the smell is happening," said Tauxe.

Anandasankar Ray says a product based on Ethyl pyruvate may cost less to produce than DEFT,the most effective chemical treatment now in use. He says DEFT is too costly for most people who live in areas affected by malaria.

“Perhaps by finding smells that can attack other target receptors, we will be able to improve upon DEFT and finally have the next generation of insect behavior control products," said Ray.

1.The best title for the passage is most probably _______________________________.

A. Scientists Find New Substance to Fight Mosquitoes

B. A New Generation of DEET Has Been Developed to Kill Mosquitoes

C. Malaria一a Serious Disease Causing 630,000 Deaths

D. Ethyl Pyruvate一an Insect Behavior Control Product

2.According to the passage, Ethyl Pyruvate can_______________________________.

A. kill the mosquitoes' smelling neurons

B. cause the mosquitoes to lose their sense of smell

C. result in the inactiveness of the mosquitoes' receptor

D. make the mosquitoes uninterested in human breath and skin smell

3.Through the passage, the writer aims to_______________________________.

A. inform readers of the new development in fighting mosquitoes

B. praise the achievements made in the battle against malaria

C. introduce a cheaper product in fighting mosquitoes

D. tell the differences between Ethyl Pyruvate and DEET

4.This passage most probably appears in_______________________________.

A. the column of newspaper ads

B. the health column of a magazine

C. a textbook of medical schools

D. a collection of doctors' essays

 

A huge cloud of dust rose and an overpass disappeared. This was the scene in Zhuzhou,Hunan Province on May 17.Nine people were killed and 16 injured.

Things were similar last year in the Sichuan earthquake. Thousands of people were buried in the ruins and lost their lives. What if we could have warned them?

People are always racking their brains to find a way of preventing buildings’ collapse. Better materials and technology help,but they are not a solution.

Just like humans,a building has its own life cycle from “birth” to “death”.If we know when a building is going to collapse,we can repair it in advance or get out of it before it falls.

Now,scientists at the University of Illinois have developed a material that turns red before it breaks. The invention could be used in things like climbing ropes or bridge supports.

The research was led by Nancy Sottos,a professor at the university’s Beckman Institute,and Douglas Davis,a graduate research assistant.

The secret behind the color?changing material is a type of molecule (分子).A molecule is a group of atoms held together by chemical bonds. Imagine you and your friends standing in a circle,holding hands. Each person stands for one atom,your hands represent the bonds,and the entire circle represents a molecule. If one person lets go of his or her hands,the molecule changes color.

The research team put the molecule into a soft material. When the researchers stretched the material,it turned bright red for a few seconds before it broke into two pieces. When they repeatedly stretched and relaxed the material,without breaking it,it only turned a little red.

The major problem is that light can get rid of the red color. When the team shone bright light on the molecule,the broken bond was fixed,and the color disappeared.

If the bright light keeps the red color from appearing,the material’s warning system will be useless. Scientists still have a lot of work to do before the color?changing molecules can be used outside the lab.

1.What does the passage mainly introduce?

A.The collapse of an overpass in Zhuzhou,Hunan Province.

B.The Sichuan earthquake

C.A material that turns red before it breaks.

D.A way of preventing building from collapsing.

2.The underlined words “racking their brains” in the third paragraph mean ________.

A.suffering a lot B.collecting beyond imagination

C.losing a lot D.thinking very hard

3.Which of the following is a WRONG statement?

A.Thousands of people died from the collapse of buildings in the Sichuan earthquake because they hadn’t been warned.

B.There is no building that will never collapse.

C.A new material has been applied to buildings to warn people of collapse.

D.A color?changing material can turn red before it breaks.

4.What can we infer from the passage?

A.The color?changing molecules are certain to be used outside the lab.

B.There will be no collapse with the help of the color?changing material.

C.There is a long way to go before the material can be applied.

D.The problem caused by bright light will be solved by scientists.

 

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