单项选择题

On the basis of their observations, scientists

A．make more observations.
B．develop hypothesis and theories.
C．reveal their observations to the public.
D．challenge their colleagues.
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单项选择题
The writer' s attitude towards the use of a computer can be best described as
A．conservative.
B．subjective.
C．uncertain.
D．favorable.
单项选择题
The writer believes that reading by the computer is advisable chiefly because
A．it saves a lot of time to find information needed.
B．it reads more efficiently than a human mind.
C．it covers a much wider range of reference.
D．it guarantees reading efficiency and validity.
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