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
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
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
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
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
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
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
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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