单项选择题

A) Eight hours. C) Three hours and a half.
B) Two hours and a half. D) Four hours.
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单项选择题
A) By a central control system. C) By several separated computers. B) By a mechanical ann. D) By a few people.
A) By a central control system. C) By several separated computers.
B) By a mechanical ann. D) By a few people.
单项选择题
A) Last month. C) Two Weeks ago. B) Last week. D) Two months ago.
A) Last month. C) Two Weeks ago.
B) Last week. D) Two months ago.
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