单项选择题

A. It’s less expensive.
B. It’s more comfortable.
C. It’s faster.
D. It’s more direct.

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单项选择题
Before the Civil War Mark Twain became a （）.

A. river pilot
B. printer’s apprentice
C. miner
D. writer
单项选择题
A. A chemistry class. B. A biology class. C. A mathematics class. D. A physics class.
A. A chemistry class.
B. A biology class.
C. A mathematics class.
D. A physics class.
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