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【单选题】
What can you learn from this text about the best method to keep fit?A.
Do more running than walking every day of the week.
B.
Exercise regularly, every other day of the week.
C.
The more exercises you do, the healthier you will be.
D.
In order to lose weight, you'd better walk faster.
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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】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】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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