单项选择题

In reading a weather map，closely spaced pressure gradient lines would indicate（）.

A.high winds
B.high overcast clouds
C.calm or light winds
D.fog or steady rain

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单项选择题
In North America the majority of the weather systems move from（）.

A.north to south
B.south to north
C.east to west
D.west to east
单项选择题
In bad weather，what length of chain should be used with a single anchor? （）

A.3 times the depth of water
B.6 times the depth of water
C.10 times the depth of water
D.15 times the depth of water
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