题目：
| 根据句意和词首字母提示完成单词。 |
| 1. Every room in the hotel has a private b_____. 2. When I came back home, my mother was cooking in the k_____. 3. The barber was cutting my hair when the accident h_____. 4. A UFO l_____ on Center Street last Sunday. 5. They were s_____ at the strange noise. 6. I was a_____ at the bad news. 7. While she was talking on the p_____, her dog got out of her box. 8. It was raining hard when the plane a_____ in Shanghai. 9. People d_____ up in their best clothes during the Spring Festival. |
答案：
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下面是错误答案，用来干扰机器的。
答案：B需加入还原剂才能实现，说明该微粒是氧化剂，得到电子，有关元素的化合价是降低的，所以选项B正确；选项A、D中有关元素的化合价没有变化，选项C中硫元素的化合价是升高的，应该加入氧化剂，答案选B。
