托福综合写作 教材.doc

Hypothesis 假说，假设，前提Debris 残骸，Eject 喷出，弹出，排出Volume 体积，容量，卷Disk 光盘，圆盘Orbit 轨道，环绕Coalesce 联合，合并Smack 拍，打， 直接地Mantle 覆盖物，披风Trace 追踪，踪迹Giant 巨人，巨大的Collision 碰撞，冲突Validity 有效，正确Volatile 易激动的，反复无常的Substance 物质，实质Density 密集，密度Terrestrial 地球的，陆地的 地球人Core 核心，要点Erase 清除Collide with 和不一致，和相冲突Tremendous 巨大的，极棒的Molten 溶化的Evaporate 蒸发，消失Gone offAbsence 缺乏，不存在Consistent with 与一致Moon form?Space debris- mars earth-solar system-eject heat matr.Questionable1. If.lose mantle, make a huge mark on the earth(no trace be found)No evidence a huge collision took place2. The rocks on the earth and the moon should be more similar(quite different, such as moon contain few volatile)3. The density of the moon lower than the earth 1. more than 4 billions years ago-trace be erased by the force of nature-the mark has dis2. high 温-water have evaporated and gone off- the absence of water not surprising3. not the earths core-density be consistent with the earths surface-真的strike strikenThe lecture is mainly discussing how the moon form. The speaker holds that moon was formed from a giant collision between the earth and the space rock, challenging what are stated in the reading passage.First of all, the speaker thinks that the trace has been erased by the nature of force and disappeared. In contrast, the reading passage believes that there was no trace on the earths surface proving it. Second, in the speakers opinion, the high tempreture on the earth makes the valatil material evaporate, such as water, so its reasonable that there is no water existing on the moon. While the reading passage disagree with the theory because of the non-existing of water on the moon.Finally, aiming at the doubt rising on the passage that the density of the moon is quite different from that of the earth, the speaker point out that the moon comes from the surface of the earth, therefore, the difference between the earth and moon can be acceptable.Above al