He is always ready to help others. That's one of his ________ .

A．strengths

B．powers

C．abilities

D．benefits

汽车行驶过程中，水箱口有蒸气排出，水箱下部却是冷的原因是（）

A.水泵损坏

B.风扇带紧

C.亏水

D.水稍少