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【单选题】
In man, the body cells contain how many pairs of chromosomes?A.
Twenty-two.
B.
Twenty-three.
C.
Twenty-six.
D.
Forty-six.
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【简答题】The computer was used in teaching. As a result,not only , but students became moreinterested in the lessons. A. saved was teachers’ energy B.was teachers’ energy saved C. ...
【简答题】是旅客登机前,安全员或乘务员检查机上所有部位,确保机上无外来人、 外来物。
【简答题】清舱是 旅客登机前,安全员或乘务员检查机上所有部位,确保机上( )、外来物。
【判断题】One of the drawbacks of a computer is that it cannot he used as a recreational device.
A.
正确
B.
错误
【单选题】An 'internal computer' (Para. 2) is ________.
A.
a computer used exclusively by one company for its own problems
B.
a person's store of knowledge and the ability to process it
C.
the most up to date in home computer a company can buy
D.
a computer from the post-war era which is very reliable
【单选题】When______this kind of computer _______?
A.
is; used
B.
was; used
C.
did; use
D.
are; used
【单选题】Why people invented the first computer?
A.
It was used to win the war.
B.
It was used to kill enemies.
C.
It was used to protect Allies.
D.
It was used to decode Nazi’s messages during the wars.
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