单项选择题

Mosquitoes generally breed in swampy areas.

A. always
B. usually
C. rarely
D. never
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单项选择题
Solar energy is generated as protons fuse to form helium atoms.
A. bred
B. conceived
C. developed
D. produced
单项选择题
Since rhetoric is the art of calculated polemic and has persuasion as its goal, can it be considered a verbal science
A. competition
B. objective
C. subject
D. core
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