4．法国化学家伊夫·肖万获2005年诺贝尔化学奖。他发现了烯烃里的碳－碳双键会被拆散、重组，形成新分子，这种过程被命名为烯烃复分解反应 。烯烃复分解反应可形象地描述为交换舞伴。(如图所示)

烯烃复分解反应中的催化剂是金属卡宾(如CH₂=M)，金属卡宾与烯烃分子相遇后，两对舞伴会暂时组合起来，手拉手跳起四人舞蹈。随后它们“交换舞伴”，组合成两个新分子，其中一个是新的烯烃分子，另一个是金属原子和它的新舞伴。后者会继续寻找下一个烯烃分子，再次“交换舞伴”。把C₆H₅CH₂CH=CH₂与CH₂=M在一定条件下混合反应，下列产物不可能存在的是

A． C₆H₅CH₂CH=M　 　　　　　B．CH₂= CH₂ 　

C． C₆H₅CH₂ CH₂ C₆H₅　 　　　　D．C₆H₅CH₂CH=CH CH₂ C₆H₅

3．除去下列物质中的杂质(括号中为杂质)，采用的试剂和除杂方法错误的是

2．下列叙述中，正确的是　　

A．因乙烯和苯分子中都含有碳碳双键，故而它们都能使溴水褪色

B．鉴别己烯和甲苯，可以通过分别向它们中滴入酸性KMnO₄溶液

C．高分子材料、盐酸、水煤气、沼气、石油等是混合物，而C₃H₈一定是纯净物

D．将乙烯通入溴水中，溴水褪色，是因为发生了取代反应

1．下列说法正确的是

A．通式相同的不同物质一定属于同系物

B．完全燃烧某有机物，生成CO₂ 和 H₂O 的物质的量之比为1 ：1，该有机物只可能是烯烃或环烷烃　　 　　

C．分子式相同而结构不同的化合物一定互为同分异构体

D．符合通式C_nH_2n-2(n≥3)的有机物一定是炔烃

2. 可根据内容要点适当增加细节，以使行文连贯。

1. 词数在80-100字.

65．Today , have scientists 　cloned 　dinosaus?

A .Yes　　 B .No　　 C .A lot　 D.Only one.

四：短文改错(共10小题，每小题1.5分，满分15分)

按要求改正所给短文的错误。如无错误，在该行右边横线上划一个勾(√)；

该行多一个词：把多余的词在该行右边横线上写出，并用斜线划掉。

该行缺一个词：在该行右边横线上写出该加的词和前后的词。

该行错一个词：在该行右边横线上写出，箭头后写出改正后的词。

　　　 One evening two young men were walking in the street.

They tried to find a chance to steal everything. The clock 　　　　　　　 66 __________

strikes twelve. Most people were in bed. Quickly they came　　　　　　 67. __________

to a house so it seemed that everyone in the house had fallen　　　 68 __________

sleeping. Standing at the front gate, one man said in English to　　 69. __________

the other at a low voice, “You wait here. I will go around to 　　　　 70. __________

the front door and then get into the house.” Suddenly out　　　　　　　 71. __________

of the house ran a dog, barking at them. The two men were　　　　　 72. __________

very afraid and ran away as fast as possibly. They didn’t stop　　　　 73 __________

until they had got to a lonely place. One man said to the other　　 74. __________

in surprise, “It’s too bad. I had thought that the dog could　　　　　　 75. __________

understand English.”

五：书面表达(共35分)

　　 假设你校来了一批加拿大的访问学生，周末学校安排他们到近郊游玩，并由你负责。请你按照下列相关信息，在出发前一天简单介绍行程与安排。

　　 注意：

64. In the author’s opinion, it is possible that ______.

　 A. some extinct species may be cloned, but not survive

　 B. extinct species may be cloned and easily survive

　 C. a gaur can have a monkey as a surrogate mother

　 D. all the extinct species may be cloned

63. The difficulty in cloning an extinct species is the lack of ______.

　 A. both the well-preserved DNA and plants to live on

　 B. both the habitat to live in and the well-preserved DNA

　 C. both habitat to live in and plants to live on

　 D. both the well-preserved DNA and a surrogate mother

62. The underlined words “a surrogate mother” probably refer to a female who -----

A. contributes its eggs to another female　 B. gives birth to a baby for another female

C. gives birth to a baby of its own　　　　 D. cannot give birth to a baby