單項(xiàng)選擇題When a wind blows round clockwise,it is().

A.Variable
B.Changing
C.Backing
D.Veering


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1.單項(xiàng)選擇題Which condition suggests that your present position lies in the navigable semicircle of a tropical storm().

A.A backing wind
B.A veering wind
C.Sustained gale force winds
D.A strong wind that maintains a constant speed and direction

2.單項(xiàng)選擇題When a tornado moves over the water from land it is called a().

A.Tornado
B.Waterspout
C.Hurricane
D.Cyclone

3.單項(xiàng)選擇題The wind is()and decreasing.

A.anticlockwise rotating
B.anticlock rotating
C.clockwise rotating
D.clock rotating

4.單項(xiàng)選擇題Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere().

A.A backing wind
B.A veering wind
C.A norther
D.A strong,gusty wind