单项选择题

It's ten years since the scientist ______on his life's work of discovering the valuable chemical element.

A．made for
B．set out
C．took off
D．turned up
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单项选择题
A business letter should be written in a formal style______ in a personal tone.
A．better than
B．other than
C．rather than
D．less than
单项选择题
One Sunday morning the local post office______ an important special letter to my home, though it was addressed to me at my office.
A．transmitted
B．transported
C．delivered
D．transferred
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