相关topi的文学知识

Thus,whenthereisonlyashortsupplyofpoor-qualityfood,thewildebeest,topi,andgazelleenjoyanadvantage.Theotherthreespeciesdifferintheproportionoflowerleavesandhigherstemsthattheyeat:zebraseatthemoststemmat...

问题详情：—Excuseme,what’sthisfor?  —It’sacleanerandit       topickupdirt.A.uses   B.isused   C.isusing   D.used【回答】B知识点：动词语态题型：选择题...