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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单项选择题
When a gladiator(角斗士) was defeated in the games arena, he might be ______ or he might be killed on the spot.
A．elevated
B．spared
C．favoured
D．consumed
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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