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第1题

The first thing ______ you should do is to observe the object carefully.

A、it
B、that
C、which
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第2题

I walked as fast as I could, but I couldn.t __________ him.

A、catch hold of
B、catch out
C、catch up with
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第3题

The faint sound is ________ undetectable to the human ear.

A、rigorously
B、virtually
C、strictly
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第4题

The new system of taxation will take ________ next year.

A、effect
B、efficiency
C、affection
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