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

Macrolinguistics includes the following branches except______.

A．psycholinguistics
B．sociolinguistics
C．theoretical linguistics
D．mental linguistics

单项选择题

It can be inferred from the passage that Chinese observations of the Sun during the late seventeenth and early eighteenth centuries______.

A．are ambiguous because most sunspots cannot be seen with the naked eye
B．probably were made under the same weather conditions as those made in Europe
C．are more reliable than European observations made during this period
D．record some sunspot activity during this period