计算:(4x2y2-2x3y)÷(-2xy)=______.
(4x2y2-2x3y)÷(-2xy),
=4x2y2÷(-2xy)+(-2x3y)÷(-2xy),
=-2xy+x2.
_____ in the mountains for a week, the two students were finally saved by the police. [ ]
A. To lose
B. Lost
C. Being lost
D. Losing
日期每加______天,星期几都是相同的.如7月2日是星期二,那么7月中还有______日、______日、______日、______日也是星期二.