单项选择题

What is the meaning of integration? （）

A. To link some separate factors as a whole chain
B. United
C. To put together
D. Mixture

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单项选择题

A. One
B. Two
C. Four
D. Three

单项选择题

A. Very long
B. Ten thousands of miles
C. Thousands of miles
D. Thousands of kilometers

单项选择题

A. In international deep sea
B. In lakes
C. In river and canals
D. Coastal ocean