单项选择题

For nearly 50 years, Spock has been a （） author writing 13 books including an autobiography and numerous magazine articles.

A. prevalent
B. precautious
C. prospective
D. prolific

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单项选择题
Researchers find it hard to （） the two sets of figures.

A. associate
B. correspond
C. correlate
D. respond
单项选择题
James denounced sorcery, adultery, （）, incest, extortion, and murder; he would not eat prepared food, which he said was unclean, and stopped drinking milk.

A. monogamy
B. monologue
C. polygamy
D. polygene
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