单项选择题

A: What about having a drink B: ______

A．Good idea.
B．Help yourself.
C．Go ahead, please.
D．Me, too.
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单项选择题
Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computers
A．Because it is extremely dangerous to conduct such research on an airplane.
B．Because it remains a mystery what wavelengths are liable to be interfered with.
C．Because research scientists have not been to produce the same effects in labs.
D．Because experts lack adequate equipment to do such research.
单项选择题
The umbrella was used only by royalty or by those in high offices ______.
A．in Europe in the 18th century
B．in ancient Egypt and Babylon
C．in the Far East in ancient times
D．during the Middle Ages
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