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______ is recorded in the history book, Diaoyu Island has belonged to China since ancient times.

A. As B. That

C. It D. What

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Though the facts that too many people on earth and a too rapid increase in the number added each year are not in argument, we always begin the discussion of "population as global issue" with what most persons mean like this. It was quite right to compare demographic growth to "a long, thin powder fuse(导火线)that bums steadily and hesitatingly until it finally reaches the charge and explodes".

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