17. Why did the pilot throw the soda bottle out of his plane windows?
A) Because the bottle was empty and useless.
B) Because he wanted to lighten the load of his small plane.
C) Because the bottle might be useful to the native Africans.
D) Because he wanted to amuse the local tribespeople.
18. What did the local people think the soda bottle was?
A) A message from the outside world.
B) A warning from the gods.
C) A symbol of misfortune.
D) A gift from the gods.
19. What is the main idea of the story?
A) The local Africans are peaceloving people.
B) Soda bottles are very precious in some remote areas.
C) A trivial thing may sometimes bring about undesirable consequences.
D) Caution must be taken in introducing new technology.
20. What do we know about the local people in the story?
A) They thought that the gods were all crazy.
B) They were isolated from the outside world.
C) They enjoyed living in the peaceful desert.
D) They worshipped the gods all the more after the incident.
Reading Comprehension
Directions: There are 4 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them the re are four choices marked A)，B)，C) and D). you should dicide 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:
More and more, the operations of our businesses, governments, and financial insitutions are controlled by information that exists only inside computer memories. Anyone clever enough to modify this information for his own purposes can reap substanitial rewards. Even worse, a number of people who have done this and been caught at it have managed to get away without punishment. Its easy for computer crimes to go undetected if no one checks up on what the computer is doing. But even if the crime is detected, the criminal may walk away not only unpunished but with a glowing recommendation from his former employers. Of course, we have no statistics on crimes that go undetected. But its disturbing to note how many of the crimes we do know about were detected by accident, no t by systematic inspections or other security procedures. The computer criminals who have been caught may been the victims of uncommonly bad luck. For example, a certain keypunch(键盘打孔) operator complained of having to stay overtime to punch extra cards. Investigation revealed that the extra cards s he was being asked to punch were for dishonest transactions. In another case, dissatisfied employees of the thief tipped off(向……透露) the company that was being robbed. Unlike other lawbreakers, who must leave the country, commit suicide, or go to jail, computer criminals sometimes escape punishment, demanding not only that they not be charged but that they be given good recommendations and perhaps other benefits. All too often, their demands have been met. Why? Because company executives are afraid of the bad publicity that would result if the public found out that their computer had been misused. They hesitate at the thought of a criminal boasting in open court of how he juggled(耍弄 ) the most confidential records right under the noses of the companys executives, a ccountants , and security staff. And so another computer criminal departs with just the recommendations he needs to continue his crimes elsewhere.
21. It can be concluded from the passage that __________.
A) it is still impossible to detect computer crimes today
B) computer crimes are the most serious problem in the operation of financial in stitutions
C) computer criminals can escape punishment because they cant be detected
D) people commit computer crimes at the request their company
22. It is implied in the third paragraph that __________.
A) many more computer crimes go undetected than are discovered
B) the rapid increase of computer crimes is a troublesome problem
C) most computer criminals are smart enough to cover up their crimes
D) most computer criminals are smart enough to cover up their bad luck
23. Which of the following is mentioned in the passage?
A) A strict law against computer crimes must be enforced.
B) Companies need to impose restrictions on confidential information.
C) Companies will guard against computer crimes to protect their reputation
D) Companies usually hesitate to uncover computer crimes.
24. What may happen to computer criminals once they are caught?
A) With a bad reputati
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