填空题

57（）

【参考答案】

A
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单项选择题
Laser-doppler radar ______.
A．measures the movements of a spaceship by means of light beam
B．makes use of microwaves
C．makes use of sound waves
D．Both A and B
单项选择题
Bond realized that he was being followed by means of ______.
A．his common sense
B．his sense of humour
C．his sight
D．his sixth sense
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