某烯烃与氢气加成后得到2，2－二甲基戊烷，烯烃的名称是（ ）
A．2，2－二甲基－3－戊烯
B．2，2－二甲基－4－戊烯
C．4，4－二甲基－2－戊烯
D．2，2－二甲基－2－戊烯
答案：C
题目分析：烯烃与氢气加成后得到2，2－二甲基戊烷，将该物质还原为不饱和烃，根据价键原则，在碳链上添加双键，只能是4，4－二甲基－2－戊烯 或4，4－二甲基－1－戊烯，所以答案选C。
| 阅读理解。 | |
| Come and see the Indian elephants and the new tigers from America. The monkeys are waiting to meet you, and the pandas from China are waiting to take pictures with you. The lovely koalas from Australia are waiting to laugh at you, and the giraffes from Africa are waiting to look down on you. The parrots want to speak to you!
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| 1. How many kinds of animals are talked about in the passage? | |
| A. Four. B. Five. C. Six. D. Seven. | |
| 2. Two brothers, one aged 14 and the other 10, with their parents go to the zoo, how much are the tickets together? | |
| A . $9.00 B. $10.00 C. $11.00 D. $12.00 | |
| 3. Which of the following is the visiting time? | |
| A. 8:30 a.m. Monday B. 9:30 a.m. Friday C. 5:00 p.m. Tuesday D. 7:00 a.m. Sunday | |
| 4. From the passage we can guess the animal "giraffe" must be very ______. A. fat B. long C. tall D. strong | |
| 5. What can we do in the zoo? | |
| A. To take some nice photos. B. To give some bananas to the elephants. C. To touch the monkeys. D. To throw things everywhere. |