单项选择题

What do you think of the black people in the U. S.

A．They form the most numerous minority.
B．They get married younger than the whites.
C．They have a higher death rate than the whites.
D．Most of them living in the countrysid

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单项选择题

The United States is composed of ______states and one district, the District of Columbi

A． 50B. 51C. 48D. 49

单项选择题

For which of the following reasons are late seventeenth and early eighteenth century Chinese records important according to the passage

A．They suggest that the data on which the Maunder minimum was predicated were incorrect.
B．They suggest that the Maunder minimum can not be related to climate.
C．They suggest that the Maunder minimum might be valid only for Europe.
D．They establish the existence of a span of unusually cold weather worldwide at the time of the Maunder minimum.