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
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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
单项选择题
The upper class in England today ______ .
A．are extremely small in number so that media pays no attention to them
B．still uses old words like "sir" in everyday life
C．includes the hereditary aristocracy
D．refers only to the royal family
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