为了银行代发工资，工资系统应具有()等功能。
A.磁盘文件格式设置
B.磁盘文件类型设置
C.制作磁盘输出文件
D.向银行传送软盘
参考答案：A, B, C
暑假期间，小明和父母一起开车到距家200千米的景点旅游，出发前，汽车油箱内储油45升；当行驶150 千米时，发现油箱剩余油量为30升。
（1）已知油箱内余油量y（升）是行驶路程x（千米）的一次函数，求y与x的函数关系式；
（2）当油箱中余油量少于3升时，汽车将自动报警，如果往返途中不加油，他们能否在汽车报警前回到家？请说明理由。
—What were you up to when she dropped in?
—I _____ for a while and _____ some reading. [ ]
A. had played; was going to do
B. played; did
C. was playing; was going to do
D. had played; did
