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In what now seems like the prehistoric times of computer history, the early post-war era（战后时期）, there was a quite widespread concern that computers would take over the world from man one day. Already today, less than forty years later, as computers are relieving us of more and more of the routine tasks in business and in our personal lives, we are facing with a less dramatic but also less foreseen problem. People tend to be over-trusting（过分信任）of computers and are re- luctant to challenge their authority. Indeed, they behave as if they were hardly aware that wrong buttons may be pushed, or that a computer may simply malfunction（失灵）.

Obviously, there would be no point in investing（投入）in a computer if you had to check all its answers, but people should also rely on their own internal computers and check the machine when they have the feeling that something has gone wrong. Questioning and routine double checks must continue to be as much a part of good business as they were in pre-computer days. Maybe each computer should come with the following warning: for all the help this computer may provide, it should not be seen as a substitute for fundamental thinking and reasoning skills.

1.What is the main purpose of this passage?

A.To look back to the early days of computers.

B.To explain what technical problems may occur with computers.

C.To discourage unnecessary investment in computers.

D.To warn against the blindness to the probable shortcomings of computers.

2.The passage recommends those dealing with computers to ________

A.be reasonably doubtful about them

B.check all their answers

C.substitute them for basic thinking

D.use them for business purpose only

3.An "internal computer" ( Para. 2 ) is ________

A.a computer used exclusively by one company for its own problems

B.a person' s store of knowledge and the ability to process it

C.the most up to date in home computer a company can buy

D.a computer from the post-war era which is very reliable  

4.The passage suggests that the present day problem with regard to computers is ________

A.challenging

B.psychological

C.dramatic

D.over-trusting

5.It can be inferred from the passage that the author would disapprove of ________

A.computer science courses in high schools

B.businessmen and women who use pocket calculators

C.maintenance（连续不断）checks on computers

D.companies which depend entirely on computers