题目

阿伏加德罗常数约为6.02×1023mol－1，下列说法中正确的是（     ） A．1.0L 1.0mol・L－1CH3COOH溶液中，CH3COOH分子数为6.02×1023 B．Na2O2与H2O反应生成1.12L O2(标准状况),反应中转移的电子数为2×6.02×1023 C．32 g S8单质中含有的S-S键个数为6.02×1023 \s\up 0(S8分子结构模型(_) D．22.4 L N2中所含的分子数为6.02×1023 答案：C 好朋友，手拉手。给下列的问句选择对应的答语。 (     ) 1. Does a kangaroo have stripes?(     ) 2. What colour is the mouse?    (     ) 3. What has a trunk?            (     ) 4. Does a lion have a mane?     (     ) 5. Can an ostrich fly?         (     ) 6. What has paws?               A. No, it can't. B. Yes, it does.  C. No, it doesn't.                                                              D. It's gray.     E. A cat.         F. An elephant.