题干

研究人员最近发现了一种“水”电池,这种电池能利用淡水与海水之间含盐量差别进行发电,在海水中电池总反应可表示为:5MnO2+2Ag+2NaCl=Na2Mn5O10+2AgCl,下列“水”电池在海水中放电时的有关说法正确的是(   )

A:正极反应式:Ag+Cl﹣e=AgCl

B:每生成1 mol Na2Mn5O10转移2 mol电子

C:Na+不断向“水”电池的负极移动

D:AgCl是还原产物

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答案(点此获取答案解析)

B

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Big City Bus Driver

    When I was 20, I went to stay with a friend for two weeks in Vancouver. My friend worked during the day, so I decided to go 1 on my own. I knew where I was and where I wanted to go, the Vancouver Aquarium (温哥华水族馆). It sounded 2.

    But soon I was completed 3 I boarded a bus, figuring it must do a circle, right? I rode a good half hour before becoming impatient and then got 4 I walked quite a while, up and down various blocks, but had no idea where I was.

    I've lived in a tiny town all my life, rarely leaving it. Being a “small town girl”, I admit I'm fairly 5about city life. People at home always told me city people were cold and unconcerned about others, so I was afraid to 6to anyone.

    I got on another bus, and then another again. Finally, after hours, I decided to get on ONE bus, and stay on 7 I recognized something. I rode over half an hour. Nothing ever seemed 8 When I became the only passenger on the bus, I began to get 9 I had no cellphone, and didn't even10 my friend's office telephone number.

    As I was about to give up and leave the bus, the driver asked11 I wanted to go. I told him the aquarium, and he laughed, saying his bus wouldn't go anywhere near. I12 back in my seat, really afraid and upset. He asked where I was from, and I told him what had happened and now I just wanted to go back to my friend's place.

    13, the driver pulled the bus over and called me to the front. He gave me detailed 14 as to which buses to take, and how to understand the bus system. He 15 printed the bus tickets I needed from his machine.

    I was shocked. He spent a good twenty minutes 16 me, telling me everything I needed to know, before giving me the tickets. I thanked him repeatedly, and asked him how much I 17 for the tickets. “Nothing. Just get yourself to your friend's home.”

    Thanks to his 18 I was able to make my way back to my friend's house. I don't know what I would have done if that driver had not taken the 19 to help me. What people had told me was not true. City people 20 just like the driver. I never did learn his name, but I'll always remember him.