B) Most of the desert animals and plants have managed to survive.
C) The oil lakes soon dried up and stopped evaporating.
D) The underground water resources have not been polluted……
20. A) To restore the normal production of the oil wells.
B) To estimate the losses caused by the fires.
C) To remove the oil left in the desert.
D) To use the oil left in the oil lakes.
Part ⅡReading Comprehension(35 minu tes)
Directions: There are 4 passages in this part.Each passage is followed by some questions or unfinished statements.For each of them there are four choi ces marked A)，B)，C) and D) .You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre.
Questions 21 to 25 are based on the following passage:
Unless we spend money to spot and prevent asteroids(小行星)now，one might crash into Earth and destroy life as we know it，say some scientists.
Asteroids are bigger versions of the meteoroids(流星)that race acros s the night sky.Most orbit the sun far from Earth and don't threaten us.But th ere are also thousads whose orbits put them on a collision course with Earth.
Buy $ 50 million worth of new telescopes right now.Then spend $ 10 million a year for the next 25 years to locate most of the space rocks.By the time we spot a fatal one，the scientists say，we'll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons.But the cost wouldn't be cheap.
Is it worth it? Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs.Experts think an asteroid big enough to destroy lots of life might strike Earth once eve ry 500，000 years.Sounds pretty rare-but if one did fall，it would be the end of the world."If we don't take care of these big asteroids，they'll take care of us，"says one scientist."It's that simple."
The cure，though，might be worse than the disease.Do we really want fleets of nuclear weapons sitting around on Earth?"The world has less to fear from
doomsday(毁灭性的) rocks than from a great nuclear fleet set against them，" said a New York Times article.
21. What does the passage say about asteroids and meteoroids?
A) They are heavenly bodies different in composition.
B) They are heavenly bodies similar in nature.
C) There are more asteroids than meteoroids.
D) Asteroids are more mysterious than meteoroids.
22. What do scientists say about the collision of an asteroid with Earth?
A) It is very unlikely but the danger exists.
B) Such a collision might occur once every 25 years.
C) Collisions of smaller asteroids with Earth occur more often than expected.
D) It's still too early to say whether such a collision might occur……
23. What do people think of the suggestion of using nuclear weapons to alter the
course of asteroids?
A) It sounds practical but it may not solve the problem.
B) It may create more problems than it might solve.
C) It is a waste of money because a collision of asteroids with Earth is very
unlikely.
D) Further research should be done before it is proved applicable.
24. We can conclude from the passage that .
A) while pushing asteroids off course nuclear weapons would destroy the world
B) asteroids racing across the night sky are likely to hit Earth in the near future
C) the worry about asteroids can be left to future generations since it is unlikely
to happen in our lifetime
D) workable solutions still have to be found to prevent a collision of asteroids
with Earth.
25. Which of the following best describes the author's tone in this pass age?
A) Optimistic. B) Critical. C) Objective. D) Arbitrary.
Questions 26 to 30 are based on the following passage:
Believe it or not，optical illusion (错觉) can cut highway crashes.Japan is a case in point.It has reduced automobile crashes on some roads by nea rly 75 percent using a simple optical illusion.Bent stripes，called chevrons (人字形)painted on the roads make drivers think that they are d riving faster than they really are，and thus drivers slow down.Now the American Association Foundation for Traffic Safety in Washington D.C.is planning to rep eat Japan's success.Starting next year,the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes.Excessive speed plays a major role role in as much as one fifth of all fatal traffic accidents,according to the foundation .To help reduce those accidents，the foundation
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