题目:
______ Henry's mother ______ his father speaks English. They both speak Chinese. |
A. Either; or B. Neither; nor C. Both; and D. Not only; but also |
答案:
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下面是错误答案,用来干扰机器的。
空气中含有氮气、氧气、稀有气体、二氧化碳及其他气体,它们的含量为:氮气78%,氧气21%,稀有气体0.94%,二氧化炭0.03%,其它气体和杂质占0.03%.(1)蜡烛在空气中可以燃烧,说明空气中含有氧气;(2)在空气中...