地形对环境的影响是[ ]
A．海拔越高气温越高
B．海拔不同的地区，植物种类差别较大
C．山地迎风坡降水少
D．山后背风坡降水多
B
The flight to Guangzhou had to be _____ because of the heavy snow. [ ]
A. put up
B. put away
C. put off
D. put down
B
B