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【单选题】
某烯烃分子式为 C 6 H 10 ,被酸性 KMnO 4 氧化,产物为 HOOCCH 2 CH 2 COOH 和二氧化碳,则原烯烃的结构式为:A.
1,4- 已二烯
B.
1,5- 已二烯
C.
3- 甲基 -1,4- 戊二烯
D.
2- 甲基 -1,4- 戊二烯
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【单选题】_____, living in big cities is more convenient because of the complete facilities provided.
A.
In all
B.
All in all
【单选题】Complete the following sentences with proper prepositions or adverbs. Are there any living things __________ the planet Mars?
A.
in
B.
on
C.
at
D.
out
【判断题】Is this a complete sentence? Then I put the backpack on the living room sofa.
A.
正确
B.
错误
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【简答题】Are they content _____ living at home, or are they living at home merely for _________(convenient) and waiting for the moment when they can be _________ (complete) independent?
【单选题】Please choose the appropriate word to complete the sentence below. Living in cities has a smaller impact on the environment than living in ___________ and rural areas.
A.
suburbs
B.
urban
C.
growth
D.
concentration
【判断题】Is this a complete sentence? Hopped out of the backpack and began jumping around the living room floor.
A.
正确
B.
错误
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