风浪的大小主要取决于（）。
A．风力、水深、风区
B．水深、风区、风时
C．风力、风区、风时
D．风力、风时、水深
参考答案：C
— Jack can't concentrate on his lessons recently.
— Yes, that might ____ why he did so badly in the last test.
A. answer for
B. apply for
C. account for
D. call for
