单项选择题

If you get into difficulties, don"t hesitate to ask ______ advice.

A．of
B．out
C．after
D．for
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单项选择题
Why are coral reefs called the rainforests of the sea
A．Because they are home to a wide variety of sea life.
B．Because they can protect our coasts from storms.
C．Because they might supply natural medicines.
D．Because they look like rainforests.
单项选择题
They have decided to put the meeting ______ till next Monday.
A．up
B．on
C．off
D．forward
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