有关放射性碘的说法，正确的是（） A.不引起甲状腺功能低下 B._爱下问搜题

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问题单项选择题 A1/A2型题

有关放射性碘的说法，正确的是（）

A.不引起甲状腺功能低下

B.其辐射作用只限于甲状腺内

C.甲亢的内科治疗

D.不能用于甲状腺功能的检查

E.用于黏液性水肿的治疗

答案

参考答案：B

解析：利用甲状腺高度摄碘能力，131I可被甲状腺摄取，并可产生β射线（占99%），在组织内的射程仅约2mm，因此其辐射作用只限于甲状腺内，破坏甲状腺实质，而很少波及周围组织，所以答案为B。

综合

图甲是各类城市用地付租能力随距离递减示意图，图乙是某城市地租分布等值线图。读图回答问题。

（1）图甲中，a、b、c所表示的不同功能区依次是____________________________。

（2）图乙中，地租分布等值线并不是规则的同心圆，而是有明显的凹凸。试分析等值线分布的规律及其

原因。

_________________________________________________________________________________________

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（3）若要在图乙①、②、③、④、⑤处选建一仓储式超市，其最好的区位是_______。

（4）该城市的地域形态属何种类型？_________。

完形填空

One Saturday, I got a phone call about electrical problems. Since I am not an electrician, I quickly       that the woman on the line had the wrong number. The woman on the phone sounded extremely        as her electricity wasn’t working. Her       tried to replace a wall switch(开关), but now some of their lights wouldn’t be on, and the heat had       .
The woman thought she was        an electrician who had done work for her in the past. I had just recently changed my        and she got me instead. I’m not an electrician but I do work with       .
I       her that she had the wrong number, and I didn’t know what her old electrician changed his number to. She       , and we said goodbye. After I hung up the phone I thought        I could help her so I dialed back and found out she was just one town over.
When I got to her house, I told her I would help her, but I would not        any money. This confused(使迷惑)her and she asked        I would bother if I wasn’t getting paid. I told her it was an act of        and to “pay it forward”. The couple, who were both retired, seemed        and said they had never met anyone like me.
Her husband had fixed the        switch which was causing a short(短路). After I was done, they thanked me and tried to give me some       . I told them I wouldn’t accept anything, and that the best        would be to find someone else to help out. I        said that if they can’t find someone else to repay then just be extra nice to each other. They were both unbelievably happy that I        to solve their electrical problems quickly, but I think I was even        at the opportunity to help them.

A．introducing

A．organization

B．electricity

D．construction

B．requirement