单项选择题

It was （） for people to find work before than today.

A．not possible
B．difficult
C．more difficult
D．easier

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单项选择题
One machine can do as much work as（）

A．40% of the people
B．4% of the people in the world
C．40 people
D．75 000 people
单项选择题
30（）

A．time
B．energy
C．interests
D．fun
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