单项选择题

Lightning is a ______ of electrical current from a el6ud to the ground or from one cloud to another.

A．rush
B．rainbow
C．race
D．rubber
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单项选择题
I' d like to ______ him to you for the job. He is very clever and capable.
A．refer
B．suggest
C．recommend
D．propose
单项选择题
The ancient Egyptians are supposed ______ rockets to the moon.
A．to send
B．to be sending
C．to have sent
D．to have been sending
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