单项选择题

We need help with the fourth problem; it ______ us.

A．persists
B．permeates
C．perplexes
D．perturbs
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单项选择题
One of the requirements for a fire is that the material ______ to its burning temperature.
A．will be heated
B．would be heated
C．is heated
D．be heated
单项选择题
The crowd ______ through the gates of the stadium.
A．scattered
B．surged
C．dissolved
D．assembled
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