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【单选题】
下列各对物质中，中心原子的轨道杂化类型不同的是( )A.
CH 4 与SiH 4
B.
H 3 O + 与NH 3
C.
CH 4 与
D.
CF 4 与SF 4
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【简答题】补全文章 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 You may not be very familiar with “ecotourism”. ___1___But in an age of growing environmental awareness, it is not too difficult for us to imagine and un...
【简答题】餐巾折花造型的选用原则有哪些?
【单选题】Catherine Clinton ______
A.
was the landlord's daughter
B.
was the housekeeper's child
C.
was the widow of the landlord's son
D.
was very poor when her husband died
【单选题】听力原文：M: Hello, Anne. This is Larry at the office. Is Fred at home? W: No, Larry. He's in class now. He'll be home for lunch though. Q: Where is Fred now? (19)
A.
At lunch.
B.
At the office.
C.
In class.
D.
At home.
【简答题】餐巾折花造型的选用原则有哪些?
【单选题】Section B Directions: There are 2 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You shou...
A.
They are sure to enjoy a longer and happier life.
B.
They have lived long enough to read this article.
C.
They are more likely to survive serious diseases today.
D.
Their average life span has been considerably extended.
【单选题】The next day the boys planted the landlord‘s garlic upside down because _______.
A.
they did not know how to plant it
B.
they wanted to teach the landlord a lesson
C.
they were afraid the dogs would bite it
D.
they made a mistake
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