单项选择题
Tropical cyclones are classified by form and intensity.Which system does not have closed isobars（）.
A.Hurricane
B.Tropical disturbance
C.Tropical depression
D.Cyclone
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A.anticlockwise rotating
B.anticlock rotating
C.clockwise rotating
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The strong wind will make us（）here for some days.
A.To stay
B.Staying
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The southeast trade winds actually blow toward the（）.
A.Southeast
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