题目

在化学学科中，经常使用下列物理量，其中跟阿伏加德罗常数（NA）均无关的组合是(    ) ①摩尔质量（M）②相对原子质量（Mr）③物质的量（n）④原子半径（r）⑤溶质的质量分数（W）⑥溶解度（S）⑦气体摩尔体积（Vm） A．①③⑥⑦         B．②④⑤⑥         C．①②③⑤         D．②③⑤⑥⑦4、The nervous-looking（紧张不安地）young man had waited for a few moments outside the jeweler's shop before he got enough courage（勇气）to enter．He was warmly greeted by a young assistant．James felt a rush blood to his face as he explained he would bring in his future wife to choose a birthday present．The assistant listened carefully and told him he'd better buy a necklace．He wasn't used to buying jewelry and was a little worried about overspending．After some discussion as to reasonable price and type, the assistant showed him dozens of necklaces and helped him to choose．At last James chose one and left the shop promising to return at five o'clock．When, half an hour later, James did return to the shop with his future wife, Laura, the assistant acted as if she had never seen him before．When she was asked to show them some necklaces, she first brought out some inexpensive ones for them to choose and then gave them the one she had prepared． A choice was soon made and they went away, satisfied． James would certainly come back to buy what he wanted when he got married． 1．A good title for this passage is ________． A．A Clever Assistant                          B．Buying a Birthday Present C．How to Choose a Necklace                  D．A Brave Young Man 2．The word "overspending" in this passage means ________． A．spending too much money B．spending too much time C．spending more time than be planned D．spending too much time and too much money 3．When James told the assistant why he wanted to buy a present, his face________． A．turned pale　　　                           B．turned red C．turned yellow　　　                        D．turned black 4．James would come back to buy what he wanted because ________． A．the assistant knew how to satisfy the people who came to buy things B．the necklace was good C．Laura liked the necklace D．the assistant who served James was very beautiful．