英语周报第22答案

1.D解析:∵z=2+ai_(2+ai)(1+i)(2-a)+(2+a)i是纯虚数,∴20,解得a=2.2+2

4.A细节理解題。根据第二段中的“ Born in1742 in present-day germany, Scheele learned about chemicalfrom his parents starting at a young age."可知5.C推理判断题。根据第二段中的“In1767, he moved to Stockholm, where he discovered tartaric acid.”和第三段“ After three years in Stockholm., oxygen”可推知6.A词义猜测题。根据第三段中的“ Scheele became the first person to identify oxygen.”和第四段该词前后的内容,可知该词指代“氧气”7.B推理判断題。根据倒数第二段可知答案。

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