问题补充:
Don’t throw litter around. Please.
A. pick it up
B. pick up it
C. pick up them
D. pick them up
答案:
(答案→)A. pick it up
B. pick up it
C. pick up them
D. pick them up
解析:本题的含义是不要乱扔垃圾,请把它捡起来,pick sth up表示把某物捡起来,sth为代词必须放在两者之间,前句使用litter,故用it来代替,故本题选A。