题目内容

Solid-fuel engines are simpler than liquid-fuel engines, ______have important uses.

A. both of them
B. both
C. both of which
D. both all

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A．theB．aC．anD．/

A. the
B. a
C. an
D. /

A little learning is a dangerous thing, ______ the saying goes.

A. like
B. as
C. with
D. if

A．had toB．shall have toC．would have toD．might have to

A. had to
B. shall have to
C. would have to
D. might have to

A．greatlyB．quicklyC．slowlyD．completely

A. greatly
B. quickly
C. slowly
D. completely