活学活用 1.cheer up 感到高兴 2.now that 既然 3.break out 突发;爆发 4.give birth to 产生;分娩 5.lay eggs 下蛋 6.prevent...from... 阻止;制止 7.watch out 当心;密切注视  8.get the hang of 熟悉;掌握  9.block out 挡住(光线)  10.in one’s turn 轮到某人;接着  Ⅰ Ⅱ Ⅲ Ⅲ.赏佳句

　　思维提优 1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.(教材原句,P25) 2.The earth became so violent that it was not clear whether the shape would last or not.(教材原句,P25) 3.This produced a chain reaction,which made it possible for life to develop.(教材原句,P26) 4.We are too far from the earth now to feel its pull.(教材原句,P30) 5.But when I tried to step forward,I found I was carried twice as far as on the earth and fell over.(教材原句,P31) 6....walking does need a bit of practice now that gravity has changed.(教材原句,P31) Ⅰ Ⅱ 6 1 2 3 4 5 1.lay　vt.put (sth/sb) in a certain position or on a surface 放置;安放;搁 spread sth (on sth);cover or coat sth with sth 摊开,涂,敷 put (sth) in the correct position for a particular purpose铺,铺设,铺放 (of birds,insects,etc.) produce (eggs) (指鸟、虫等)产(卵) ①They produced young generally by laying eggs.(教材原句,P26)  它们一般是通过孵蛋而繁衍后代的。 ②I laid my book aside,turned off the light and went to sleep. 我把书放在一边,关了灯睡觉。 Ⅰ Ⅱ 6 1 2 3 4 5

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