比+3大-7的数是______.
比+3大-7的数是:3+(-7)=-4.
算盘上面每颗珠代表5,下面每颗珠代表1.______.
—Look! The trousers look so nice! Can I ?
—Of course.[ ]
A. try them on
B. try on them
C. try on it
D. try it on