SectionIILearningaboutthelanguage一、课前预习I
较早些时候__________________________2
如果你想要……__________________________3
地球引力__________________________4
构成岩石___________________________5
逃离地球___________________________6
一项重要的研究话题___________________________7
全球变暖___________________________8
遮住阳光___________________________9
变为灭绝___________________________10
撞击地球___________________________II
完成句子:1
Althoughitsoriginmaystillbeapuzzle,themoon_________________________________asatelliteoftheearth
尽管月球的起源仍是个迷,但它只能是地球的一个卫星
__________________,theearthhadnowateratall
起初,地球上没有水
Whentheanimalsthat____________________themdisappeared,mammalsmultiplied
当对他们有危害的动物消失后,哺乳动物繁衍起来
Peoplethinkthat___________________themoontravelledthroughspaceasasmallplanetwhichwascaughtbytheearth’sgravity人们认为很早时候月球是作为被地球引力抓住的一个小