单项选择题

A flashing red light ______ motorists to trouble ahead.

A．reminded
B．alerted
C．warned
D．cautioned
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单项选择题
What does Mary think is awful
A．Telecommunication.
B．War.
C．Soccer.
D．Watching television.
单项选择题
Why don’t all ice crystals in clouds immediately fall to Earth
A．They are balanced by the pressure of rain droplets.
B．The effect of gravity at high altitude is random.
C．They are kept in the sky by air current.
D．They are moving about with fixed direction.
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