The inner cloud bands of a hurricane，when viewed from a distance，form a mass of dense，black cumulonimbus clouds called the（）.

单项选择题The greater the pressure difference between a high and a low pressure center，the（）.

A.dryer the air mass will be
B.cooler the temperature will be
C.greater the force of the wind will be
D.warmer the temperature will be

单项选择题The form of cloud often known as mackerel sky which is generally associated with fair weather is（）.

A.nimbostratus
B.stratus
C.cirrocumulus
D.cumulonimbus

单项选择题The fog produced by warm moist air passing over a cold surface is called（）.

A.conduction fog
B.radiation fog
C.frontal fog
D.advection fog

单项选择题The belt of light and variable winds between the westerly wind belt and the northeast trade winds is called the（）.

A.subtropical high pressure belt
B.intertropical convergence zone
C.doldrum belt
D.polar frontal zone

单项选择题The atmosphere in the vicinity of a high pressure area is called a(n)（）.

A.anticyclone
B.cold front
C.occluded front
D.cyclone