可引起暴发性腹泻的是（）
A．顺铂
B．长春新碱
C．环磷酰胺
D．氟尿嘧啶
E．博来霉素
参考答案：D
After 5 days, his food _____ and the boy who had left home had to return again. [ ]
A. gave up
B. gave off
C. gave in
D. gave out
中华人民共和国所属民用航空器的国籍标志是由（）表示。
A.大写字母A
B.大写字母B
C.大写字母W
D.大写字母Y
