In average, for every 1,000 feet increase in the troposphere, the temperature of the air will .
A.descend 2℃
B.descend 3℃
C.descend 4℃
正确答案是A
In average, for every 1,000 feet increase in the troposphere, the temperature of the air will .
A.descend 2℃
B.descend 3℃
C.descend 4℃
正确答案是A