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【单选题】
(CH 3 ) 2 CHCH 2 C(CH 3 ) 2 CH 2 CH 3 的 CCS 名称应是 :
A.
3 , 3 , 5- 三甲基己烷
B.
2 , 4 , 4- 三甲基己烷
C.
2 , 3 ,3 - 三甲基己烷
D.
2 , 2 , 4- 三甲基己烷
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【简答题】阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 The elephant and the fly An elephant was standing and picking leaves from a tree. A small fly came，flying and buzzing (嗡嗡叫) near his ear. The elephant waved it away with ...
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