unit 4 astronomy the science of the stars
ⅰ.重点单词聚焦
1.it cost him more than one________(十亿) dollars to complete the project.
答案: billion
2.“what happened?” john’s mother asked him in a________(温和的) voice.
答案: gentle
3.before the earth’s protective________(大气层) was formed,there was no life except in the sea.
答案: atmospher资源难易程度:★★★★★★★★★★★★★★★
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