Some were insects. Others, called amphibians， 7.________(be) able to live on land as well as in the water.

　　Finally, some small clever animals appeared and spread all

　　over the earth. But they treat the planet in an

　　8.__________(friend) way, and the earth becomes too

　　9.________(pollute). Whether life will continue on the earth

　　for millions of years to come will depend on 10.________

　　this problem can be solved. Unit 4　Astronomy: the science of the stars were　 unfriendly　 基 础 自 主 梳 理 whether 　 polluted 　 返回目录 ◇ 单词点睛 ◇ harmful 　 adj. 有害的；伤害的(causing or capable

　　of causing harm)

　　(1)be harmful to　

　　对……有害

　　(2)do sb harm/do harm to sb

　　伤害某人

　　There is (no) harm in (sb's) doing sth

　　(某人)做某事有(无)害处

　　(3)harm n．& vt.

　　损伤；伤害

　　harmless adj.

　　无害的 Unit 4　Astronomy: the science of the stars 考 点 互 动 探 究 返回目录 【活学活用】 (1)[2015·江苏卷·阅读B] Many wastes produced in the

　　producing process are harmful as well.

　　在生产过程中产生的废品也是有害的。 (2)Scientists do not know how much and what kinds of

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