单项选择题

Computer data bases and electronic mail systems have been around since the late 1970s.

A) 计算机数据库和电子邮件自20世纪70年代末，便无处不在了。
B) 20世纪70年代后期以来，计算机数据库和电子邮件系统已被广泛使用。
C) 20世纪70年代末，计算机数据基础和电子邮递系统就已经在大家周围了。
D) 在20世纪70年代后期，计算机数据库和电子邮件已普及了。
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It’s stated in the fourth paragraph that ______.
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B．Einstein enjoyed reading about wars
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Which of the following is NOT mentioned as part of an assistant stage manager’s job
A．Help advertise plays.
B．Play minor roles.
C．Collect tickets.
D．Take care of the dress to be worn on the stage by an actor or actress.
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