题目内容

Vitamin B is essential for human body.

A. Right
B. Wrong
C. Not mentioned

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Stomach cancer is the most dangerous among all cancers.

A. Right
B. Wrong
C. Not mentioned

There is an apparent link between lung cancer and vitamin A.

A. Right
B. Wrong
C. Not mentioned

Major manufacturers have been using "quality circle" with undeniable success for more them

A. 100 years
B. 20 years
C. 50 years
D. 10 years

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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