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【简答题】
I began to smoke when I was in high school. My parents didn't care much. They both smoked, and my older brother did, too. In school, the teachers talked against smoking, but the cigarette advertisements were so exciting. The men in the ads were so good-looking and so successful, and the women were well, they were beautiful and sophisticated. I read a book called how to stop smoking. The writer said that smoking wastes time, and that cigarettes cost a lot of money. Ten years later, everyone began to hear about the negative effects of cigarette smoke: lung disease, cancer, and heart problems. After that, there was a health warning on every pack of cigarettes. Then two events made me think of giving up smoking. First, I started to cough. I thought it was just a cold, but it didn't get better. Second, my brother got lung cancer. He got sicker and sicker. My brother and I used to smoke cigarettes together over twenty years, and we smoked our last cigarettes together the day before he died. I sat with him in his hospital room, and I decided to quit. "NO more cigarettes, ever." I said to myself. However, it was very hard to stop. I tried several times to quit on my own--without success. Finally, I ran out of excuses--I might say my excuses went up in smoke. I joined the " Stop Smoking" program at the local hospital, which also ended up in failure.
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【单选题】There is not much time left for you to cover everything you'd better ______ unimportant points.
A.
leave off
B.
focus on
C.
leave out
D.
concentrate on
【单选题】可用来鉴别甲烷和乙烯, 又可用来除去甲烷中混有的少量乙烯的操作方法(    )
A.
混合气通过盛饱和食盐水溶液的洗气瓶
B.
混合气通过盛足量溴水的洗气瓶
C.
混合气通过盛水的洗气瓶
D.
混合气跟氯化氢混合
【单选题】Directions: Read the following passage. Each passage is followed by some questions. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice. Junk food is...
A.
People should be educated not to eat too much.
B.
It is widely consumed despite its ill reputation.
C.
Its temptation is too strong for people to resist.
D.
It causes more harm than is generally realized.
【单选题】可用来鉴别甲烷和乙烯,又可用来除去甲烷中混有的少量乙烯的操作方法(  )
A.
混合气体通过盛饱和食盐水溶液的洗气瓶
B.
混合气体通过盛足量溴水的洗气瓶
C.
混合气体通过盛水的洗气瓶
D.
混合气跟氯化氢混合
【单选题】工业生产乙烯中,乙烯精馏塔塔顶出料成份有()。
A.
乙烯;
B.
乙烯、甲烷、氢气;
C.
甲烷、氢气;
D.
乙烯、甲烷。
【单选题】既可用来鉴别乙烯和甲烷,又可以用来除去甲烷中混有的乙烯的方法是 [     ]
A.
通入溴水中
B.
将气体点燃
C.
通入酸性高锰酸钾溶液中
D.
一定条件下与H 2 反应
【单选题】可用来鉴别甲烷和乙烯,又可用来除去甲烷混有的少量乙烯的是 [     ]
A.
混合气通过成饱和食盐水的洗气瓶
B.
混合气通过盛足量溴水的洗气皮瓶
C.
混合气通过盛水的洗气瓶
D.
混合气和氯化氢混合
【简答题】阅读理解。 Come to Austria (奥地利) Soll is a village in the mountains in western Austria. And the Post Hotel is clean and not ex-pensive. It is opened by a local family. From the hotel you can see the whole ...
【单选题】干作业成孔灌注桩桩径允许偏差值是多少?
A.
±50
B.
>20
C.
±20
D.
-20
【单选题】既可以用来鉴别乙烯和甲烷,又可用来除去甲烷中混有的乙烯的方法是(  )
A.
通入足量溴水中
B.
与酸性高锰酸钾溶液反应
C.
在导管中处点燃
D.
一定条件下与H 2 反应
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