单项选择题


A．lead
B．connect
C．collect
D．communicate
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单项选择题
A．thereB．whenC．whichD．where
A．there
B．when
C．which
D．where
单项选择题
Georges Valensi's patent lasted until 1971 because ______.
A．nobody would offer any reward for his, patent prior to that time
B．his patent could not be put to use for an unusually long time
C．there were not enough TV stations to provide color programmes
D．The color TV receiver was not available until that time
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