Three quarters of the earth__with water.A.is covering B.are covered C.is covered D.are covered

题目

Three quarters of the earth__with water.A.is covering B.are covered C.is covered D.are covered
I'm leaving,and don't try to ___me from going.Which of the following is not right?A.prevent B.stop C.keep D.protect
My hometown used to be a small place__with__it is now.A.compared;how B.cmparing'what C.compared; what D.comparing;how
请说明理由

答案

第一题C
Three quarters of the earth可作为一个整体看待,因此用单数
翻译：地球四分之三覆盖着水
第二题这道问题问的是哪个选项不正确,选择 D
第三题C 因为我的家乡不能主动被比较,所以比较的动作是被动的,因此使用被动语态,淘汰BD
第二个空选择连词,我们看这个连词既要在从句中充当表语又要充当主句的介词宾语,只能使用what ,how不能这么用