如图是人性别决定示意图,请回答相关问题。(每空1分,共6分) (1)由图可知,

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问题:

如图是人性别决定示意图,请回答相关问题。(每空1分,共6分)

(1)由图可知,父亲能产生数量相同的两种类型精子,而母亲只能产生一种类型的卵细胞.因此,小华的性染色体组成是      XY,性别为     。男性可见,生男生女主要取决于      精子的类型.

(2)小华的体细胞内染色体数量为      23对,染色体是由蛋白质             DNA组成的。

(3)小华的父母如果再生一个孩子,是女孩的机率为        

考点:人的性别遗传人的性别决定
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流动性偏好利率理论的提出者是()。

A.俄林

B.凯恩斯

C.罗伯逊

D.弗里德曼

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以政府调研员的身份,用不超过350字的篇幅,提出解决给定资料所反映问题的方案。要有条理地说明,要体现针对性和可操作性。

题型:实验题

女孩,14岁,近10个月来右上腹痛频繁伴黄疸,且逐渐加重,大便呈陶土色,消炎利胆治疗无好转。患儿出生后6天曾行先天性胆总管囊肿十二指肠吻合术。

确诊的方法以下哪种较好()

A.静脉胆道造影

B.腹部X线平片

C.经皮肝穿刺造影

D.腹部B超

E.上消化道造影

题型:实验题

Until the late 1940s, when television began finding its way into American homes, companies relied mainly on print and radio to promote their products and services. The advent of television (1) a revolution in product and service. Between 1949 and 1951, advertising on television grew 960 percent. Today the Internet is once again (2) promotion. By going online, companies can communicate instantly and directly with prospective customers. (3) on the World Wide Web includes advertising, sponsorships, and sales promotions (4) sweepstakes, contests, coupons, and rebates. In 1996 World Wide Web advertising revenues (5) $ 300 million.

Effective online marketers don’t (6) transfer hard-copy ads to cyberspace. (7) sites blend promotional and non-promotional information indirectly delivering the advertising messages. To (8) visits to their sites and to create and (9) customer loyalty, companies change information frequently and provide many opportunities for (10) .

A prototype for excellent (11) promotion is the Ragu Web site. Here visitors can find thirty-six pasta recipes, take Italian lessons, and view an Italian film festival, (12) they will find no traditional ads. (13) subtle is the mix of product and promotion that visitors hardly know an advertising message has been (14) . Sega of America, maker of computer games and hardware, uses its Web site for a (15) of different promotions, such as (16) new game characters to the public and supplying Web surfers the opportunity to (17) games. Sega’s home page averages 250,000 visits a day. To heighten interest in the site, Sega bought an advertising banner on Netscape (18) increasing site visits by 15 percent. Online (19) in Quaker Oats’ Gatorade promotion received a free T-shirt in exchange for answering a few questions. Quaker Oats reports that the online promotion created product (20) and helped the company know its customers better.

13()

A.Since

B.However

C.Such

D.So

题型:实验题

下面不属于吗啡与哌替啶共性的是()

A.激动中枢阿片受体

B.用于人工冬眠

C.提高胃肠道平滑肌及括约肌张力

D.引起直立性低血压

E.有成瘾性

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