单项选择题

Most animal fats are saturated, containing more hydrogen than carbon, and do not spoil as easily as unsaturated fats.

A. melt
B. get used up
C. go bad
D. liquify
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单项选择题
Many of Edith Wharton's best stories were completed under great personal strain.
A. poverty
B. privacy
C. resentment
D. tension
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