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27. They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.

A. which; that    B. it; one      C. that; one       D. one; that

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26. They find themselves surrounded by colorful rocks, fishes, seashells and plants, all ____ slowly in the blue water.

A. waving and moving  B. waved and moved

C. waved and moving    D. waving and moved

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25. Even though the pure water is ____ gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.

A. the one      B. which         C. what          D. that

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24. Mike is Mrs.’ pet student, ____ all her students no one else is as nice as he.

A. because      B. because of       C. with          D. as 

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23. He came running along and climbed ____ the train just as it was about to leave.

A. aboard       B. board         C. abroad       D. on abroad 

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22. Just as one of the parents ____ it, students today are under far greater stress than ever.

A. says        B. speaks       C. puts          D. gets

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第一节 语法和词汇知识(共15小题;每小题1分,满分15分)

从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

21. All the classmates are trying to make the party ____.

A. success    B. a success     C. succeeded     D. successfully

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35.(10分)果蝇是一种非常小的蝇类,遗传学家摩尔根曾因对果蝇的研究获得诺贝尔奖。下图是果蝇的体细胞染色体及基因组成,请据图回答。   .

   

(1)该果蝇是   倍体,如果要对果蝇进行基因组测序,需要检测     条染色体;

(2)摩尔根等人用纯种灰身残翅果蝇与纯种黑身长翅果蝇交配,所获得子代全部为灰身长翅,由此推出,果蝇的显性性状         ;

(3)图示果蝇形成的配子中同时含有b、r两个隐性基因的概率是    

(4)科学家发现纯合的长翅品系的果蝇幼虫在350C条件下培养(正常培养温度为250C),长成的成体果蝇仍为残翅,这种表现型能否遗传?      为什么?             

(5)假设控制某对相对性状的基因A(a)位于果蝇x、Y染色体的同源区段上,现有表现为显性性状的两只雌雄果蝇杂交,请分析说明后代表现型情况。

贵州省云峰中学09-10学年高二下学期3月月考

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