高一必修三unit4课件练习题.ppt

即学即练 根据句子的意思在括号里填入适当的词语。 (1)The bird________its eggs in other birds nests. (2)he is a political leader that________________________________(非常强调) individual responsibility. (3)He________some money________for rainy days. lays lays great stress on lays aside 课件 6．They laid eggs too and existed on the earth for more than 140 million years.(p.26) 它们也生蛋，在地球上生存了1.4亿年。 课件 词语链接 exist vi.存在；生存 existence n．存在 exist＋介词.存在于地方 exist on sth.靠某物生存 Does life exist on Mars? 火星上有生命吗？ I can hardly exist on the wage Im getting. 我靠我挣的工资简直难以糊口。 课件 即学即练 用exist的短语或其适当形式填空。 (1)This plant________only________Australia. (2)Can you________________such a low salary? (3)I doubt the________(exist) of alien. exists in exist on to existence 课件 7．Thus they have，in their turn，become the most important animals on the planet.(p.26) 于是，他们接着成为这个行星上最重要的动物。 课件 in ones turn 轮到某人；接着 in turn 轮流；一个接着一个 by turns 轮流；一阵……一阵…… take turns (to do sth.) 轮流(做某事) Its ones turn to do sth. 轮到某人做某事了 Its your turn to clean the classroom. 轮到你打扫教室了。 词语链接 课件 即学即练 用上述短语完成下列句子。 (1)She went hot and cold________________． (2)In our class，each students recitation comes________________(轮流)． (3)They，_______________，made a proposal. (4)Each of you must______________________________(依次发言)． by turns by turns/in turn in their turn take turns to make a speech 课件 8．How life began on earth is one of the biggest puzzles that scientists found hard to solve.(p.27) 生命到底是如何开始的是科学家们觉得最难解决的难题之一。 课件 词语链接 puzzle n．难题 v．迷惑 puzzlement n．迷惑 puzzled adj.感到困惑的 puzzling adj.使迷惑的 be puzzled about 对……感到疑惑 课件 即学即练 选用上述词语完成下列句子。 (1)To explain the________findings, he offers two theories. (2)I________________that I havent heard from Tom for so long. (3)She listened with a________ expression on her face. (4)No one has yet succeeded in explaining the________of how life began. puzzling am puzzled puzzle puzzled 课件 was puzzled What puzzles me 课件 课件 此句为主从复合句。主语为主语从句，从句由连词whether 引导，不定式to come作years的定语。whether t