--- I hear that Jason is planning to buy a new car.

--- I know. By next month, he ________ enough for a used one.

A．has saved

B．saves

C．will be saving

D．will have saved

（）可能导致机油压力高的故障。

A．机油黏度过高

B．曲轴瓦、连杆瓦与曲轴之间的配合间隙过小

C．活塞环或汽缸壁磨损严重

D．机油滤清器过脏，但是旁通阀却打不开