题目内容

动点和动系互换后，不会改变绝对运动、相对运动与牵连运动。

A. 对
B. 错

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There are _______ state-recognized ethnic groups in China.

A. 56
B. 54
C. 52
D. 50

2.The Miao are the fourth largest group by population in China.

A. fifth
B. fourth
C. third
D. sixth

China was the first country in the world to breed fresh water fish.As early as __________years ago,the Chinese began raising fish in ponds.

A. 2,800
B. 3,500
C. 2,500
D. 3,000

More than _______years ago Confucius even accepted bacon for lessons.

A. 2,500
B. 2,400
C. 2,600
D. 3,000