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單項(xiàng)選擇題

Cycling is a good exercise.（）, it doesn't pollute the air.

A.Therefore
B.Moreover
C.But
D.However

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單項(xiàng)選擇題

Speed limits should lead（） fewer deaths on the roads.

A.to
B.off
C.on
D.in

單項(xiàng)選擇題

The hospital is carrying（）tests to find out what’s wrong with her.

A.over
B.out
C.off
D.away

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