a bit of practice

　　. ……既然重力改变了，看来走路也的确需要练一练了。 twice as far as on the earth does need now that gravity has changed 答案 The earth was just 1.

　　cloud of dust after the “Big Bang”.The earth exploded loudly 2.

　　fire and rock.They were in time to produce many things，which were to make the earth’s atmosphere.As the earth cooled down，water began to appear on 3.

　　surface.It allowed the earth to dissolve 4.

　　(harm) gases.Then life began to develop. Small plants multiplied and filled the oceans and seas with oxygen.This encouraged the 5.

　　(develop) of early shellfish and fish.Land animals such 6.

　　insects，reptiles and dinosaurs appeared after green plants appeared. a with its harmful development as 答案 课文语法填空 Small clever animals spread all 7.

　　the earth.They are putting too much carbon dioxide into the atmosphere,8.

　　prevents heat from escaping from the earth into space.9.

　　life will continue on the earth for millions of years to come will depend on whether this problem can

　　10.

　　(solve). over which Whether be solved 答案 返回 边讲边练

　　突破核心考点

　　harmful adj.有害的；造成损害的 1. (1)be harmful to对……有害 (2)harm n.& vt.伤害；损害 do sb.harm＝do harm to sb.伤害某人；对某人有害 There is no harm in doing...做……没有害处。 (1)The drought was harmful to the crops. 这场干旱对农作物有危害。 (2)Fruit juice can do harm to children’s teeth. 果汁可能会损害儿童的牙齿。 多维训练 (1)单句语法填空 ①Don’t believe him.No harm

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