现有下列八种物质：①稀硫酸 ②水银 ③白磷 ④胆矾 ⑤混有金刚石颗粒的石墨 ⑥含氮量35%的硝酸铵 ⑦甲烷 ⑧酒精，其中属于单质的是______（填编号，下同）；属于化合物的是______；属于混合物的是______；属于有机物的是______．
①稀硫酸是硫酸的水溶液，属于混合物；
②水银是由汞元素组成的纯净物，属于单质；
③白磷是由磷元素组成的纯净物，属于单质；
④胆矾是由铜、硫、氢、氧四种元素组成的纯净物，属于化合物；
⑤混有金刚石颗粒的石墨是由金刚石和石墨两种物质组成的混合物；
⑥纯净的硝酸铵中氮元素含量=
×100%=35%，含氮量35%的硝酸铵为化合物；14×2 14×2+4×1+16×3
⑦甲烷由碳、氢两种元素组成，既是化合物，也是有机物；
⑧酒精有碳、氢、氧三种元素组成，既是化合物，也是有机物．
故答案为：②③；④⑥⑦⑧；①⑤；⑦⑧．
| 完形填空。 | |||
| Chris Jones recently finished a very unusual journey. Our reporter Mary met him at his home in south London and he told her all about the trip. Reporter: What gave you the idea to travel around India on an elephant, Chris? Chris: Well, it all started two years ago when I was planning a trip to India. I visited a photographic ( 摄影) exhibition of ___1___ and I realized that the only way to travel around India was on an elephant. Reporter: What did you do next? Chris: I flew to New Delhi and started ___2___ an elephant. I needed an elephant ___3___ to carry people. I didn't know anything about elephants, so I asked an expert for help. He taught me ___4___ to ride an elephant. He also helped me find an elephant. Reporter: Can you tell me about the journey? Chris: Well. I bought a female elephant called Tara ___5___ about $ 6,000. We set off from New Delhi a week later. We were heading to Sonepur in northern India where there is a big elephant market and I could sell Tara ___6___ And what a ride!Elephants can travel at about 6 miles an hour and Sonepur was more than 1,200 km away. The journey ___7___ us 64 days! Reporter: Did you have any problems on your journey? Chris: Yes, a few. ___8___ nothing serious. On the third day, Tara hurt her foot. But that got better quickly. Also there was a lot of heavy rain during the first week and we got very wet! Reporter: What happened when you reached Sonepur? Chris: My plan was to sell Tara. But by now I was very fond of her. I couldn't ___9___ her back to Britain and I didn't want to sell her at the market. By chance, I met some people who wanted an elephant for their national park. I knew that Tara would be safe with them, so I gave her to them. I was very ___10___ to say goodbye. | |||
| ( )1. A. dolphins ( )2. A. looking for ( )3. A. train ( )4. A. what ( )5. A. with ( )6. A. hard ( )7. A. cost ( )8. A. And ( )9. A. take ( )10. A. angry | B. dogs B. looking at B. training B. why B. in B. easily B. took B. But B. bring B. serious | C. elephants C. finding C. trained C. where C. at C. hardly C. spent C. So C. taking C. sad | D. monkeys D. found D. is trained D. how D. for D. easy D. paid D. Then D. bringing D. happy |