单项选择题

I ______ him the Christmas gift by mail because he came home during the Christmas holidays.

A. ought to have sent
B. couldn't have sent
C. must have sent
D. needn't have sent
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单项选择题
Changing from solid to liquid, water takes in heat from all substances near it, and this ______ produces artificial cold surrounding it.
A. absorption
B. transition
C. consumption
D. interaction
单项选择题
The music aroused an ______ feeling of homesickness in him.
A. intentional
B. intermittent
C. intense
D. intrinsic
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