单项选择题

The atmosphere,a narrow band of gases surrounding the Earth,is maintained by gravitational pull.()

A. clear
B. freezing
C. thin
D. poisonous

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Black Americans are more likely to die of cancer than
A. people in other countries.
B. white Americans.
C. all other Americans.
D. their ancestors.
单项选择题
According to the passage, the glaciers moved from the north directly the the south().

A.Right
B. Wrong
C. Not mentioned
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