A-A+
In what condition does a typhoon begin？A．When
问题详情
In what condition does a typhoon begin？
A．When the warmer air meets with the cooler air.
B．When the wind moves faster than 30 meters a second.
C．When the seawater evaporates into the air.
D．When the air gets warmer and warmer.
参考答案
正确答案：B
解析：短文提到当风速大于30米/秒时，台风就开始了，故选B。
