人教版必修三unit4重点长难句解析

Unit 4 Astronomy:the science of the stars 1. The earth became so violent that it was not clear whether the shape would last or not.(Page 25) 地球(开始)变得激烈动荡,不知道这个固体形状是否会继续存在下去。 ★violent adj.猛烈的;激烈的;强暴的 2.Water had also appeared on other planets like Mars but,unlike the earth,it had disappeared later.(Page 26) 像火星一样其他行星上也曾出现了水,但和地球不同的是,这些水后来都消失了。 ★unlike prep.不像;不同 句型一:It is unlikely that...不可能…… 句型二:It’s very unlike sb.to do sth.做某事实在不像某人平时的作风。 3. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.(Page 26) 很多科学家相信,由于地球上长期有水存在,使地球得以把有害气体和酸性物质溶解在海洋里。 ★harmful adj. 有害的 4.They laid eggs too and existed on the earth for more than 140 million years.(Page 26) 它们也生蛋而且在地球上生存了一亿四千多万年。 ★exist vi. 存在;生存 句型:There exists/existed...某地有… 5. These animals were different from all life forms in the past,because they gave birth to young baby animals and produced milk to feed them.(Page 26)