网友您好，请在下方输入框内输入要搜索的题目：

搜题

题目内容（请给出正确答案）

[主观题]

Batteries Built by Viruses What do chicken pox, the common cold, the flu, and AIDS have i

n common？ They're all disease caused by viruses, tiny microorganisms that can pass from person to person. It's no wonder that when most people think about viruses, finding ways to steer clear of viruses is what's on people's minds. Not everyone runs from the tiny disease carriers, though. In Cambridge, Massachusetts,scientists have discovered that some viruses can be helpful in an unusual way. They are putting viruses to work, teaching them to build some of the world's smallest rechargeable batteries. Viruses and batteries may seem like an unusual pair, but they're not so strange for engineer Angela Belcher, who first came up with5 the idea. At the Massachusetts Institute of Technology (MIT) in Cambridge, she and her collaborators bring together different areas of science in new ways. In the case of the virus-built batteries, the scientists combine what they know about biology, technology and production techniques. Belcher's team includes Paula Hammond, who helps put together the tiny batteries, and Yet-Ming Chiang, an expert on how to store energy in the form of a battery. "We're working on things we traditionally don't associate with nature," says Hammond. Many batteries are already pretty small. You can hold A, C and D batteries6 in your hand. The coin-like batteries that power watches are often smaller than a penny. However, every year, new electronic devices like personal music players or cell phones get smaller than the year before. As these devices shrink, ordinary bakeries won't be small enough to fit inside. The ideal battery will store a lot of energy in a small package. Right now, Belcher's model battery, a metallic disk completely built by viruses, looks like a regular watch battery. But inside, its components are very small-so tiny you can only see them with a powerful microscope. How small are these battery parts？ To get some idea of the size, pluck one hair from your head. Place your hair on a piece of white paper and try to see how wide your hair is-pretty thin, right？ Although the width of each person's hair is a bit different, you could probably fit about 10 of these virus-built battery parts, side to side, across one hair. These microbatteries may change the way we look at viruses？ According to the first paragraph people try to

A. kill microorganisms related to chicken pox, the flu, etc

B. keep themselves away from viruses because they are invisible

C. stay away from viruses because they are causes of various diseases

D. cure themselves of virus-related diseases by taking medicines

查看答案

更多“Batteries Built by Viruses What do chicken pox, the common cold, the flu, and AIDS have i”相关的问题

第1题

The Gap of Lifespan between Men and Women(1) People are living longer than ever, but for s

The Gap of Lifespan between Men and Women

(1) People are living longer than ever, but for some reason, women are living longer than men. A baby boy born in the United States in 2003 can expects to live to be about 73, a baby girl,about 79. this is indeed a wide gap, and no one really knows why it exists. The greater longevity (长寿) of women, however, has been known for centuries. It was, for example,described in the seventeenth century. However, the difference was smaller then--the gap is growing.

(2) A number of reasons have been proposed to explain the differences. The gap is greatest in industrialized (个体的) societies, so it has been suggested that women are less susceptible to work stress that may raise the risk of heart disease and alcoholism (酗酒). Sociologists also tell us that women are encouraged to be less adventurous than men (and this may be why they are more careful drivers, involved in fewer accidents).

(3) Even smoking has been implicated in the age discrepancy (差异). It was once suggested that working women are more likely to smoke and as more women entered the work force, the age gap would begin to close, because smoking is related to earlier deaths. Now, however, we see more women smoking and they still tend to live longer although their lung cancer rate is climbing sharply.

(4) Some researchers have suggested that men may die early because their health is more strongly related to their emotions. For example, men tend to die sooner after losing a spouse than women do. Men even seem to be more weakened by loss of a job. (Both of these are linked with a marked decrease in the effectiveness of the immune system.) Among men, death follows retirement with an alarming (令人担忧的) promptness (迅速).

(5) Perhaps we are searching for the answers too close to the surface of the problem. Perhaps the answers lie deeper in our biological heritage. After all, the phenomenon is not isolated to humans. Females have the edge among virtually ( 几乎 ) all mammalian (哺乳动物的) species, in that they generally live longer. Furthermore, in many of these species the differences beginat the moment of conception; there are more male miscarriages ( 流产 ). In human, after birth, more baby boys than baby girls die.

23. paragraph 1 __________

24. paragraph 2 __________

25. paragraph 3 __________

26. paragraph 4 __________

A. Much Male Miscarriages

B. The Reason for the Gap Grows Different

C. The Greater Longevity of Women.

D. Health Is More Strongly Related to Their Emotion,,

E. Women Are Living Longer than Men

F. Example for the Age Discrepancy

27——30补全句子

27. Ababy boy live to be about 73, a baby girl, about 79, this has __________

28. Women are less likely to work stress that may raise the risk of __________

29. More women smoking and they still have __________

30. The phenomenon is not isolated to humans __________

A. has impact on

B. a wide gap

C. a longer life

D. animal species

E. different societies

F. heart disease and alcoholism

点击查看答案

第2题

请教：2015大学英语三级（A级）标准预测试卷1第2大题第23小题如何解答？

【题目描述】

It is generally thought to be of necessity to a college student that he _______ (know) at least one foreign language.

【我提交的答案】：knows

【参考答案分析】：

know 解析：—看见“It is generally thought to be of necessity to a college student that...”结构从necessity上就应反映出用虚拟语气。

【我的疑问】

that he....he 是第三人称，为什么know不用加s？？

点击查看答案

第3题

请教：2015大学英语三级（A级）标准预测试卷1第2大题第6小题如何解答？

【题目描述】

"How ______ will you finish your homework?""In half an hour."A．long

B．soon

C．often

D．fast

【我提交的答案】： A

【参考答案与解析】：

正确答案：B

答案分析：

解析：考点为副词搭配辨析。在本题的四项选择中，只有soon才可以用于本句中。若用how often， how far表达的意思不清楚；若选用long似乎意思很明白，但在逻辑上有问题。Finish只是二持续时间非常短的动作，不能和表示一段时间的时间状语连用。

为什么不能选a

点击查看答案

第4题

请教：2015大学英语三级（A级）标准预测试卷1第2大题第2小题如何解答？

【题目描述】

The bridge was named ______ the hero who gave his life for the cause of the people.A．after

B．with

C．by

D．from

【我提交的答案】： C

【参考答案与解析】：

正确答案：A

答案分析：

解析：词组固定搭配。name after意为“以……命名”。例如：The child was named after its father．(这孩子是照他的父名命名的。)The ship was named after Queen Mary．(这船以玛丽皇后命名。)句型中的介词 after表示“模仿……方式、仿照……式样、有……风格”之意，可和一些动词搭配使用。例如：The temple is built after the model of Greece．(此寺院是依照希腊式样建造的。)They live after foreign models．(他们过着西式生活。)剩下的三个介词一般不和动词name搭配使用。

点击查看答案

第5题

请教：2014年大学英语三级(cet3)A级全真模拟试卷(7)第3大题第4小题如何解答？

【题目描述】

He must have heard of the bad news,______________can be perceived in his expression.A.as

B.what

C.while

D.that

【我提交的答案】： C

【参考答案与解析】：

正确答案：A

答案分析：

【译文】从他的表情可以看出来，他一定是听说了这个消息。

【考点】定语从句

【解析】as在这里作关系代词，引导非限定性定语从句，说明前面整句话，符合题意，故选A。

点击查看答案

第6题

请教：2015大学英语三级（A级）全真模拟试卷3第2大题第4小题如何解答？

【题目描述】

No matter how frequently ______, the works of Beethoven always attracts large audience.A．performing

B．performed

C．to be performed

D．being performed

【我提交的答案】： C

【参考答案与解析】：

正确答案：B

答案分析：

解析：考让步状语从句。句首的让步状语从句完整的形式如下：No matter how frequently the works of Beethoven are performed。

完整句型里的are不见了？那个，不是被动语态吗？

点击查看答案

第7题

请教：2015大学英语三级（A级）全真模拟试卷3第2大题第6小题如何解答？

【题目描述】

The room is in a terrible mess; it ______ cleaned.A．mustn't have been

B．shouldn't have been

C．can't have been

D．wouldn't have been

【我提交的答案】： A

【参考答案与解析】：

正确答案：C

答案分析：

解析：对过去否定的推测用“can't have+过去分词”。

是不是有个说法，肯定用must，否定用can’t？

点击查看答案

第8题

请教：2015大学英语三级（A级）标准预测试卷1第2大题第28小题如何解答？

【题目描述】

The discovery of sulfa drugs, like the discovery of penicillin ______ (come) out by accident.

【我提交的答案】：was came

【参考答案分析】：

comes out 解析：come out：(1)(照片上)显露；结果是：She came out well in that photograph．那张照片中她照得很好。(2)公开；问世；出版；被发行When does John's book Come out? 约翰的书什么时候出版?

不用被动语态吗？

点击查看答案

第9题

请教：2015大学英语三级（A级）标准预测试卷1第2大题第25小题如何解答？

【题目描述】

I ______ (inform) that the meeting had been cancelled.

【我提交的答案】：have informed

【参考答案分析】：

was misinformed 解析：句意：我被告知会议已经取消了。

可以是have informed吗？

点击查看答案

账号：尚未登录

登录没有账号？去注册

我要提问

联系客服

购买搜题卡

题库练习

课程学习

功能	扣减规则
功能	基础费（查看答案）	加收费（AI功能）
文字搜题、查看答案	1/每题	0/每次
语音搜题、查看答案	1/每题	2/每次
单题拍照识别、查看答案	1/每题	2/每次
整页拍照识别、查看答案	1/每题	5/每次