单项选择题

His health is ______ .

A．as poor as, if not poorer than, his sister's
B．as poor, if not poorer than, his sister
C．poor as his sister's if not poorer
D．as poor, if not poorer than, his sister's

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单项选择题

In cold climates, the wood-frame dwelling, properly built and insulated, ______ warmest type of home.

A．and the
B．the
C．is the
D．where it is the

单项选择题

If you really want yourself to be in good health, you must ______ always ______ so much.

A．not; be smoking
B．not; have smoked
C．not; to smoke
D．be not; smoking