单项选择题

He drives much ______than he did ten years ago.

A．carefully
B．more careful
C．more carefully
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What can visitors do at the Maryland Science Center
A．Learn science by trying it out.
B．Watch and take part in a play.
C．Make gifts for their friends.
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How did Mr. Black tetrurn to London
A．By train.
B．By ship.
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