题目内容

The oscillator was easier to use, more stable, and less expensive than others available at

A. changeable
B. unchanging
C. diverse
D. strong

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Major product categories encompass electronic test and measuring instruments, solid-state

A. round
B. include
C. around
D. and

Companies whose profits do not exceed $ 1500 in any one year may opt to pay income tax at

A. choose
B. operate
C. manage
D. decide

More than 1000, 000 Americans die of lung cancer every year.

A. Right
B. Wrong
C. Not mentioned

Too much vitamin-A supplements can be poisonous.

A. Right
B. Wrong
C. Not mentioned

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