is this skateboard yours?no it's not ours it's theirs
helen,come.and have the grapes
likes---like
they---them
policemem---policeman
is---are
taking---putting
这个词组真不知道
设原价为X 公式:X乘以4/5=144 解得X=180
总共加水量 50%+50%=100% 和牛奶一样多( 但是考虑纯牛奶里面也含水的话那么还是喝的水多,不过小学题目应该不用考虑吧)