单项选择题

Implied but not stated is that（）

A．laser-doppler radar is more accurate than microwave radar
B．microwave radar may not ensure absolute precision in measuring varying speeds
C．the light-beam radar can measure only slow speeds with accuracy
D．microwave radar operates at a higher frequency than laser-doppler radar

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单项选择题
What is a front tail ( Para. 7 ) ( )
A．Pretending to be somebody else.
B．Following somebody from in front.
C．Following somebody from behind.
D．Standing in front of a shop window.
单项选择题
Why did Bond stop in the doorway to the underwear shop ( )
A．To see who was following him.
B．To look at the man in the fun suit.
C．To avoid the sunshine.
D．To look at the underwear.
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