单项选择题

Nylon (is made) (of air), coal (and) (water).

A. is made
B. of air
C. and
D. water
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(African) elephants are larger, (fiercer), and (difficulter) to tame (than) Asian elephants.
A. African
B. fiercer
C. difficulter
D. than
单项选择题
Nora hardly (never) misses (an) opportunity (to play) (in) the tennis tournaments.
A. never
B. an
C. to play
D. in
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