单项选择题

Glassmaking was the first major industry in the United States.

A. profitable
B. productive
C. sizable
D. specialized
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单项选择题
Although fish have no vocal organs, they still are able to make noises.
A. signals
B. bubbles
C. sounds
D. ripples
单项选择题
It is difficult to get young people to plan for their old age, which seems very distant to them.
A. impossible
B. faraway
C. observable
D. fearful
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