How to get rid of waste is a great problem for the world today. Waste must be treated 16 it does not become a danger to life.   17 , in some countries, waste from factories is still poured straight into rivers. People who use the water from one of these rivers often get   18 . The water  may become so polluted that it   19  all the fish in the river. When these rivers finally reaches the   20 , it pollutes the ocean.
In many countries with   21 , human waste is piped directly into the sea without being dealt with. This is not   22 . Although the sea itself can break up the waste, beaches   23  become polluted.   24  scientists suggest people take the waste far out to sea in ships where the wind and waves break it down.
In 1989 an international law was passed to   25  people putting waste into the sea. It is now against the   26  to put anything into the sea nearby. Such rubbish as plastics may not be thrown   27  the sea anywhere. Other waste may be put into the sea, either 19 or more than 40 kilometers from land,   28  the nature of the materials.
The   29  of dealing with waste has become so great that several international organizations have been   30  to protect the world and control pollution.

Batteries can power anything from small sensors to large systems．While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves．University of Missouri（MU） researchers are developing a nuclear energy source that is smaller, lighter and more efficient．
“To provide enough power, we need certain methods with high energy density（密度）”，said Jae Kwon, assistant professor of electrical and computer engineering at MU．“The radioisotope（放射性同位素） battery can provide power density that is much higher than chemical batteries．”
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanical systems （M/NEMS）．Although nuclear batteries can cause concerns, Kwon said they are safe．
“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems．”
His new idea is not only in the battery’s size, but also in its semiconductor（半导体）．Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor．
“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure（晶体结构） of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem．”
Together with J．David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery．In the future, they hope to increase the battery’s power, shrink its size and try with various other materials．Kwon said that battery could be thinner than the thickness of human hair．
【小题1】Jae Kwon gave examples in Paragraph 4_________．

完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从下列各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
The human nose is an underestimated tool. Humans are often thought to be  1___ smellers compared with animals, but this is largely because, unlike animals, we stand upright. This means that our noses are  2 to detecting those smells which float through the air,  3  the majority of smells which stick to surfaces. In fact though, we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of  4 human smells even when these are  5  to far below one part in one million.
　　  6    , some people find that they can smell one type of flower but not another, while others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate  7    smell receptors in the nose. These receptors are the cells which sense smells and send  8   to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when  9    to it often enough.
　　The  10  for insensitivity to smell seems to be that brain finds it  11   to keep all smell receptors working all the time but can  12  new receptors if necessary. This may also explain why we are not usually sensitive to our own smells we simply do not need to be. We are not  13    of the usual smell of our own house but we  14    new smells when we visit someone else's. The brain finds it best to keep smell receptors _ 15   for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.

Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”

Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanical systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.

“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”

His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.

“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”

Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.

Which of the following is true of Jae Kwon?

A. He teaches chemistry at MU.

B. He developed a chemical battery.

C. He is working on a nuclear energy source.

D. He made a breakthrough in computer engineering.

Jae Kwon gave examples in Paragraph 4_________.

A. to show chemical batteries are widely applied.

B. to introduce nuclear batteries can be safely used.

C. to describe a nuclear-powered system.

D. to introduce various energy sources.

Liquid semiconductor is used to _________.

A. get rid of the radioactive waste

B. test the power of nuclear batteries.

C. decrease the size of nuclear batteries

D. reduce the damage to lattice structure.

According to Jae Kwon, his nuclear battery _______.

A. uses a solid semiconductor

B. will soon replace the present ones.

C. could be extremely thin

D. has passed the final test.

The text is most probably a ________.

A. science news report  B. book review

C. newspaper ad    D. science fiction story

PART FOUR   WRITING (45%)

Everyone has experienced trying, but failing to master a difficult book that was begun with the hope of increasing one's understanding. When that happens, it is ?　36　?to think that it was a mistake to try to read it, but that was not the mistake. The mistake was in ?　37　? too much from the first reading of a(n) ?　38　? book. If you read it in the right way, no book written for the ?　39　?reader, no matter how difficult, need be a cause for despair(令人失望).

What is the right method? The ?　40　? is an important and helpful rule of reading that is either not ?　41　? or often forgotten. That rule is simply this: when reading a difficult book for the first time, read it through without ever ?　42　? to think about the things that you do not understand immediately.

Do not be stopped by what you ?　43　? understand. Read through the difficult ?　44　?,and you soon come to things that you do understand. Read these ?　45　?.You will have a much better chance of understanding all of the book when you read it again, but that ?　46　? you to have read the book through once ?　47　?.

What you understand by reading the book through to the ?　48　? will help you when you try later to read the places that you did not ?　49　? in your first reading. Or if you never re-read the book, understanding half of it is much better than understanding ?　50　? of it, which will happen ?　51　? you allow yourself to be stopped by the first difficult part of the book.?

Most of us were taught to ?　52　? the things that we do not understand. We were told to find the ?　53　? of unfamiliar words, and to try to find an explanation in another ?　54　? for anything that we did not understand in the book that we were reading. But when these things are done before the proper time, they only ?　55　? our reading, instead of helping it.

36. A. necessary     B. useful C. natural       D. effective?

37. A. learning       B. wanting      C. accepting    D. expecting?

38. A. easy     B. difficult     C. important   D. correct?

39. A. ordinary      B. young C. serious       D. sincere?

40. A. method B. question     C. answer       D. problem?

41. A. taught  B. known       C. sure    D. perfect?

42. A. starting B. hesitating   C. Stopping    D. repeating?

43. A. can't     B. won't  C. mustn't       D. wouldn't?

44. A. words   B. articles       C. parts   D. points?

45. A. quickly B. immediately      C. clearly       D. carefully?

46. A. requires       B. causes C. advises       D. allows?

47. A. later     B. after   C. before D. again?

48. A. top       B. end     C. bottom       D. cover?

49. A. see       B. turn    C. Notice D. understand?

50. A. anything      B. everything  C. nothing      D. something?

51. A. if B. so that C. whenever   D. as though?

52. A. put away     B. put down    C. think of      D. think about?

53. A. uses     B. Meanings   C. Spellings    D. troubles?

54. A. thinking      B. reading      C. Book  D. way?

55. A. harm    B. increase      C. Improve     D. prevent??