2017届高考英语一轮基础知识复习课件：必修3 Unit 4 Astronomy the science of the stars（新人教版）_高考复习指南

2017届高考英语一轮基础知识复习课件：必修3 Unit 4 Astronomy the science of the stars（新人教版）

　　Ⅴ.语篇填空 No one knows exactly how the earth began, as it happened so long ago. However, according to a ①________(wide) accepted theory, the universe began ②________ a “Big Bang” that threw matter in all directions. After that, atoms began to form and combine to create stars and other bodies. For several billion years after ③________ “Big Bang”， the earth was still just a cloud of dust. What ④________ was to become was ⑤________(certain) until between 4.5 and 3.8 billion years ago ⑥________ the dust settled into a solid globe. The earth became so violent ⑦________ it was not clear whether the shape would last or not. It ⑧________(explode) loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gases, ⑨________ were to make the earth's atmosphere. What is even more important is that as the earth cooled down, water began to appear ⑩________ its surface. 答案：①widely　②with　③the　④it　⑤uncertain　⑥when　⑦that　⑧exploded　⑨which　⑩on 考点探究演练 1.harmful adj. 有害的；伤害的归纳拓展 be harmful to sb. 对某人有害 harm n. & vt. 损伤；伤害 do sb. harm(＝do harm to sb.) 对某人有害

　　do more harm than good 弊大于利 There's (no) harm in (sb.'s ) doing sth. (某人)做某事(没)有害处 It does (no) harm for sb. to do sth. (对于某人来说)做某事(没)有害处 mean no harm 没有恶意 harmless adj. 无害的 ②These days, breaking traffic rules and littering are not uncommon, causing serious harm ________ life and the environment. 这些天，违反交通规则和乱扔垃圾的现象很常见，对生活和环境造成了严重的破坏。 ③If you want to solve the problem in this way, there is no harm ________ calling him. 如果你想以这种方式来解决问题，你不妨给他打个电话。答案：①harmful　②to　③in