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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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
单项选择题
(As is known) to all, sometimes it is very (difficult) to (tell) the difference between technical English (from) everyday English.
A．As is known
B．difficult
C．tell
D．from
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