问题
选择题
有八种物质：①甲烷、②甲苯、③聚乙烯、④聚异戊二烯、⑤2－丁炔、⑥环己烷、⑦环己烯，既能使酸性高锰酸钾溶液褪色，又能使溴水因反应而褪色的是[ ]
A．③④⑤⑧
B．④⑤⑦
C．④⑤
D．③④⑤⑦⑧
答案
答案：B
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有八种物质：①甲烷、②甲苯、③聚乙烯、④聚异戊二烯、⑤2－丁炔、⑥环己烷、⑦环己烯，既能使酸性高锰酸钾溶液褪色，又能使溴水因反应而褪色的是[ ]
A．③④⑤⑧
B．④⑤⑦
C．④⑤
D．③④⑤⑦⑧
答案：B
| 完形填空。 | |||
| Sports play an 1 part in our life. All over the world, people enjoy sports. Wherever you are, you can 2 different kinds of sports or games. Some sports or games can go back to thousands of 3 , like running and jumping. Chinese Kung fu, for example, has a very long history. 4 basketball and volleyball are new. Neither has a history of a hundred years. People are inventing new sports or games all the time. Sports help people keep healthy and happy and live 5 . Lots of people take part in sports and play games. But some people like to watch 6 do sports. In order to watch the games, some people 7 tickets or turn on their TVs at home. They don't go to bed until the games are 8 . When their player gets the first or their team wins, they often 9 very excited. When the seasons change, sports will change. In seasons, people play different games. For example, swimming is fun in warm weather just like in summer, but skating or skiing (滑雪) is popular in 10 . | |||
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