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问题 单项选择题

如果顾客点用白酒、红葡萄酒、啤酒和饮料时，在宴会开始前五分钟之内将（）斟入每位宾客杯中，斟好以上酒后就可请客人入座。

A、啤酒

B、红葡萄酒

C、白酒

D、红葡萄酒和白酒

答案

参考答案：D

单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Microwave communication uses high-frequency (26) waves that travel in straightlines through the air. Because the waves cannot (27) with the curvature of the earth, they can be (28) only over short distance. Thus, microwave is a good (29) for sendingdata between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or (30) . These can be installed on towers, high buildings, and mountain tops.

A．repeaters

B．radars

C．telephones

D．antennas
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单项选择题

8086CPU有一个始终指向堆栈顶部的地址指针是（）。

A.IP

B.BP

C.SP

D.BX
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