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问题 选择题

下图是科学家利用先进的生物科学技术，培育出能生产含人乳铁蛋白牛奶的奶牛—— “牛牛”的过程图解，则下列叙述不正确的是 

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A．“牛牛”的培育过程应用了先进的生物转基因技术        

B．在生物学上，图中A、B过程的操作方法分别被称为“人工体外受精”和“胚胎移植”

C．根据图示情况，黄色丙牛产下的“牛牛”的毛色性状表现应该是黄色        

D．“牛牛”长大后，其经济价值与普通的奶牛最根本的区别是其乳汁中含有人乳铁蛋白

答案

答案：C

单项选择题

人类多倍体的染色体数目是（）。

A、23

B、45

C、46

D、92
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单项选择题

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.

6（）

A.merely

B.virtually

C.hardly

D.actually
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