排气温度过高不会（）。
A.使冷却水温上升
B.影响润滑油的粘度
C.使余隙容积增加
D.使积炭严重
参考答案：C
— Go for a walk, OK?
— _____. I love getting close to nature. [ ]
A. I couldn't agree more
B. I'm afraid not
C. I believe not
D. I don't think so
30．1 tried to fix the car myself but ______ the attempt after a couple of hours．
A．gave in
B．gave off
C．gave up
D．gave away
