汽车制动时车辆跑偏，其原因是（）。
A.左右转向轮制动力不等
B.左右两后轮制动力不等
C.前后车轮制动力不等
D.方向用力不等
参考答案：A
-- The Sichuan student drew extra attention by writing his essay in ancient Chinese characters.
-- _____How many students can do that?[ ]
A. How come?
B. So what?
C. Why not?
D. What about?
鲍温病演变为侵袭性鳞癌的百分率约为（）
A.1%
B.5%
C.10%
D.15%
E.20%
