He needs a pen to write _____. [ ]
A. to
B. in
C. with
D. /
答案:C
长200m的火车通过某隧道用去了时间10min,若火车速度为30m/s,求隧道的长.
善治下肢风寒湿痹的药物是()
A.羌活
B.独活
C.木瓜
D.防己
E.五加皮