【学习目标】

重点单词 astronomy, system, religion, theory, atom, billion, globe, violent, carbon, atmosphere, unlike, fundamental, harmful, acid, chain, multiply, oxygen, exist, thus, dioxide, puzzle, biology, biologist, gravity, satellite, gentle, physicist, climate, crash, spaceship, pull, float, mass 重点短语 solar system, in time, prevent...from, depend on, lay eggs, give birth to, in one's turn, carbon dioxide, block out, cheer up, now that, break out, watch out 重点语法 Noun Clauses as the subject: Noun Clauses as the subject is also called the Subject Clause. That means a Noun Clause serves as Subject in the sentence. The words which are used in this Noun Clause are: that, whether, who, what, which, when, where, how, why, etc.

【课前预习】

1. astronomy n. 天文学→astronomer n. 天文学家

2. system n. 系统；体系；制度→systemic adj. 系统的；涉及全系统的

3. religion n. 宗教；宗教信仰→religious adj. 宗教的

4. theory n. 学说；理论

5. violent adj. 猛烈的；激烈的；强暴的→violence n. 暴力；暴行

6. unlike prep. 不同；不像→ likely adj. 很可能的

7. harmful adj. 有害的→harm n. 有害

8. multiply vi. & vt. 乘；增加

9. exist vi. 存在；生存→existence n. 存在；生存

10. thus adv. 因此；于是