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Question
An important reason for the large daily temperature range over deserts is:
Options:
A .  There is little water vapor in the air to absorb and re-radiate infrared radiation
B .  The light-colored sand radiates heat very rapidly at night
C .  Dry air is a very poor heat conductor
D .  Free convection cells are unable to form above the hot desert ground
E .  The ozone content of desert air is very low
Answer: Option A

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