问题
选择题
是常规核裂变产物之一，可以通过测定大气或水中
的含量变化来检测核电站是否发生放射性物质泄漏。下列有关
的叙述中错误的是 [ ]
A. 
的化学性质与 I相同
B. 
的原子序数为53
C. 
的原子核外电子数为78
D. 
的原子核内中子数多于质子数
答案
答案：C
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是常规核裂变产物之一，可以通过测定大气或水中的含量变化来检测核电站是否发生放射性物质泄漏。下列有关的叙述中错误的是 [ ]
A. 的化学性质与 I相同
B. 的原子序数为53
C. 的原子核外电子数为78
D. 的原子核内中子数多于质子数
答案：C
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| My dad was a used car salesman. Every 1 on Thursday, he would head off to Shreveport, LA to the auction (拍卖). Once, I was riding with him on the highway when he 2 a hitchhiker (搭便车的旅行者) with a backpack. As soon as Dad saw him, he pulled the car over and offered him a 3 . Dad asked him where he was going. The hitchhiker in front of me said he headed out to the west. Dad told him we were heading to Shreveport so that was as far as we could take him. I can't remember 4 but he told Dad lots of things that made him decide to go to the west. I sat in the 5 seat and watched the scene with 6 . I could see the hitchhiker changed his 7 as he could feel someone was really 8 him. It was quite an exchange and I watched it carefully as if I were 9 notes in order not to miss one word. I did know it was quite cold outside and the hitchhiker was very 10 to be able to stay in our car. We drove another forty-five minutes before we had to 11 the highway. We pulled over and Dad told him to keep his head 12 and things would start getting better for him soon. He 13 his pocket and handed the hitchhiker a twenty- dollar bill. The guy was very pleased now. His face 14 right there on the 15 , dark highway. We 16 on and my dad didn't say a single thing. I was 17 completely amazed by what I had just seen. I was always told by everyone to never 18 up a hitchhiker and yet my dad did it every time he saw one. He always gave them money even if he did not have very much of his own. I learned a lot about my dad and 19 . I learned that just one single kind act can 20 someone's life. | ||||
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