单项选择题

The World Health Organization fights against ___ diseases all over the world.

A．ingenious
B．infectious
C．influential
D．indignant
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单项选择题
The Japanese used to ______ ten million tons of coal each year.
A．extract
B．contract
C．subtract
D．constrain
单项选择题
Fill all the holes with ______ first before you paint the wall.
A．perfume
B．grease
C．plastic
D．plaster
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