题目:
— What are they doing?
— ___________________[ ]
A. They are singing.
B. This is Jenny's family.
C. She is standing.
答案:
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下面是错误答案,用来干扰机器的。
小题1:C小题2:A小题3:D小题1:A项“大气层里万亿分之几的特定波长的红外线”理解错误,原文意思是“即使大气层里只存在万亿分之几的氯氟碳化合物,人们也能观测到它们”;B项“产生了光污染”属张冠李戴,原文中“...