单项选择题

Petrol is manufactured from the ______ oil we take out of the ground.

A．crude
B．raw
C．rough
D．tough
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单项选择题
The size of the audience, ______ we had expected, was well over one thousand.
A．whom
B．who
C．as
D．that
单项选择题
At present, there is a ______ of iron and steel and more must be produced.
A．Limit
B．loss
C．poverty
D．scarcity
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