单项选择题

Many houses could be warmer if they were （） so that the heat is not lost.

A. insulated
B. simulated
C. stimulated
D. radiated

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单项选择题
The central provinces have floods in some years, and（）

A. droughts in others
B. droughts are others
C. while other droughts
D. others in drought
单项选择题
Even though your argument is （）, I still would like to have more proof.

A. plausible
B. prevalent
C. exquisite
D. extravagant
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