题目内容

下列命题中正确的为

A. 若x0为f(x)的极值点,则必有f'(x0)=0
B. 若f'(x)=0,则点x0必为f(x)的极值点
C. 若f'(x0)≠0,则点x0必定不为f(x)的极值点
D. 若f(x)在点x0处可导,且点x0为f(x)的极值点,则必有f'(x0)=0

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Which countries use English as their mother tongue?

A. Japan and Italy.
B. China and France.
C. England and America.

How many languages are very important in the world?

A. Many.
B. A few.
C. About 1,500.

What does the writer think of the ads in the newspapers or magazines?

A. He believes what the ads said.
B. He thinks the ads must be very expensive.
C. He thinks the ads never turned out true.

What can we learn from small children's experience in learning their mother tongues?

A. We must live in England or America.
B. We must keep on practicing.
C. We must get help from good teachers, records, tapes, books and dictionaries.

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