单选题 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.

【正确答案】 A

【答案解析】[解析]作者建议使用电脑主要是因为电脑节省时间。第五行：As anyone knows who has ever spent days in libraries in search of errant information，simply identifying relevant sources absorbs inordinate amounts of time in research．故应选A。