题目

下列与阿伏加德罗常数的值（NA）有关的说法正确的是（    ） A．NA个Fe（OH）3胶体粒子的质量为107g B．常温下，2.7g铝片投入足量的浓硫酸中，铝失去的电子数为0.3NA C．0.012kg（金刚石）中含有c—c键数目为2NA D．常温常压下，1.7g H2O2中含有的电子数为NA  答案：【答案】CCloze test. The first letter is given. 在空格内填入适当的词, 使内容通顺.首字母已给. 　　When the sun shines every morning, it is (1) d________. The sun sends (2) i________ light into your room, and (3) t________ you it is time to get up. When the sun shines, you must not lie in (4) b________ and sleep. You should work and (5) s________.