Passage 3
In what seems like the prehistoric times of computer history；the earth’s postwar era,there was quite a widespread rumor that computers Would take over the world from man one day． Already today，1ess than fifty years later，as computers are relieving us of more and more 0f the routine tasks in busirles$and in our personal lives,we are faced with a less dramatic but riot less foreseert problem．People tend to be over-trusting of computers and are reluctant 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
Obviously,there would be no point in investing in a computer if you had to cheek 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 businessas they were in pre-computer days．Maybe each computer should come with the warning：for all the help this computer may provide，it should not be seen as a substitute for fundamental thinking and reasoning skills.
40．What is the main purpose of this passage?