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单项选择题

Question 17 to 20 are based on the follwing passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.

Jet streams are different from most of the winds we experience because ______.

A.it imposes influences on the weather.
B.it blows at high speed and high altitude.
C.it flows from east to west.
D.it can be useful to man.
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