语法单选题,达人来.7.balletdancerslearnfivebasicpositionsforthearmsandfeet.(A)Allof(B)Ofevery(C)All(D)Every我选的是A,6.Whennaturalgasburns,itsintoatomsofcarbonandhydrogen.(A)hydrocarbonmolecules,breaking

Question

语法单选题,达人来.
7._____ ballet dancers learn five basic positions for the arms and feet.
(A) All of
(B) Of every
(C) All
(D) Every
我选的是A,
6.When natural gas burns,its___ into atoms of carbon and hydrogen.
(A) hydrocarbon molecules,breaking up
(B) broke up by hydrocarbon molecules
(C) hydrocarbon molecules break up
(D) broken up hydrocarbon molecules
A错在哪里?这个句子怎么改就可以选A了?
10.Natural selection is defined as the process ___the course of evolution by preserving those traits best adapted for an organism's survival.
(A) to which directs
(B) of which directs it
(C) directs it
(D) that directs
我选的是A,

Answer 1

7、一般说来,all和all of 都可以放在有限定词(如冠词、物主代词等)修饰的名词之前.
但是,如果名词前面没有限定词,则不能用all of.ballet dancers 前没有冠词the,所以只能用all不能用all of.
6.这句是时间状语从句," its___ into atoms of carbon and hydrogen"是主句.如果选A,breaking up 作伴随状语,主句就是its hydrocarbon molecules,只剩主语部分没有谓语,句子成分不完全.
10.如果选A,direct ...to..使某事物转向或对准某一方向,句意不通.本来direct 就是及物动词"指示"的意思,所以连接词前面不需要加介词,直接用which/that directs 就可以了 答案选D