4. According to the passage,what results from the introduction of computers？
A. After re-training, all employees in the firm get new jobs.
B. A considerable proportion of people are employed in key posts.
C. The firm keeps all of its original staff members.
D. The decrease in staff members may be balanced by the increase of firm activities.
5. James Callaghan's attitude towards computers can be best described as ．
A. doubtful
B. regretful
C. unfriendly
D. supportive
Passage 2
Questions 6 to 10 are based on the following passage:
The vitamins necessary for a healthy body are normally supplied by a good mixed diet, including a variety of fruits and green vegetables. （78） It is only when people try to live on a very restricted diet that it is necessary to make special provision to supply the missing vitamins.
An example of the dangers of a restricted diet may be seen in the disease known as beri-beri. （79） It used to distress large numbers of Eastern peoples who lived mainly on rice. In the early years of this century, a scientist named Eijkman was trying to discover the cause of beri-beri. At first he thought it was caused by a germ. He was working in a Japanese hospital, where the patients were fed on polished rice which had the outer husk removed from the grain. It was thought this would be easier for weak and sick people to digest.
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