使用塑料外壳的电气工器具应防止碰、磕以免损坏外壳，且严禁与（）及其他有机溶剂接触。
A.松锈剂
B.水
C.酒精
D.汽油
参考答案：D
— I went to your house yesterday afternoon, but you were not in.
— Sorry. I _______ basketball with my classmates.
A．am playing
B．was playing
C．played
D．have played
下列程序执行的结果为（ ）。 x=25：y=20：z=7 Print "S"；x+z*y；")"
A．S(47)
B．S(165)
C．S(25+7*20)
D．S(87)
