单项选择题

All this（）that knowledge comes from practice.

A. speaks
B. proves
C. explains
D. teaches

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单项选择题
—How do you find the talk given by Mr. Smith —（）

A. Very well
B. Excited
C. Boring
D. Not at all
单项选择题
—（） —I'm suffering from a stomachache.

A. Are you feeling better
B. What's trouble with you
C. Is there wrong with you
D. What's the matter with you
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