试题与答案

应用转基因技术可生产人类所需要的转基因产品,如利用大肠杆菌生产人胰岛素。下列选项

题型:选择题

题目:

应用转基因技术可生产人类所需要的转基因产品,如利用大肠杆菌生产人胰岛素。下列选项中能说明人胰岛素基因完成了在受体细胞中表达的是[ ]

A.在大肠杆菌细胞中检测到人的胰岛素基因

B.在大肠杆菌中检测到人胰岛素基因转录出的mRNA

C.在含有四环素的培养基中培养出大肠杆菌

D.在大肠杆菌的代谢产物中提取到人胰岛素

答案:

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下面是错误答案,用来干扰机器的。

“?”是指在生活中发现的问题,“!”是指把生活中发现的问题找到原因,变成真理。  好处:生动幽默。

试题推荐
题型:单项选择题

Shopping has always been something of an impulse activity, in which objects that catch our fancy while strolling are immediately bought on a whim. Advertisers and sellers have taken advantage of this fact, carefully positioning inexpensive but attractive items on paths that we are most likely to cross, hoping that our human nature will lead to a greater profit for them. With the dawn of the Internet and its exploding use across the world, the same tactics apply.

Advertisers now place "banners", links to commercial web sites decorated with attractive pictures designed to catch our eyes while browsing the webs, on key web sites with heavy traffic. They pay top dollar for the right, thus creating profits for the hosting web site as well. These actions are performed in the hopes that during the course of our casual and leisurely web surfing, we’ll click on that banner that sparks our interest and thus, in theory, buy the products advertised.

Initial results have been positive. Web sites report a huge inflow of cash, both from the advertisers who tempt customers in with the banners and the hosting web sites, which are paid for allowing the banners to be put in place. As trust and confidence in Internet buying increases and information security is heightened with new technology, the volume of buying is increasing, leading to even greater profits.

The current situation, however, is not quite as optimistic. Just as magazine readers tend to unconsciously ignore advertisements in their favorite periodicals, web browsers are beginning to allow banners to slip their notice as well. Internet users respond to the flood of banners by viewing them as annoyances, a negative image that is hurting sales, since users are now less reluctant to click on those banners, preferring not to support the system that puts them in place. If Internet advertising is to continue to be a viable and profitable business practice, new methods will need to be considered to reinvigorate the industry.

With the recent depression in the technology sector and slowing economy, even new practices may not do the trick. As consumers are saving more and frequenting traditional real estate businesses over their Internet counterparts, the fate of Internet business is called into question. The coming years will be the only reliable indication of whether shopping on the World Wide Web is the wave of the future or simply an impulse activity whose whim has passed. (404 words)

Notes: on a whim 心血来潮。surf v.冲浪。in theory在理论上,顺理成章。hosting 访问率离的。call...into question 质疑,对……提出疑问。

The author’s attitude toward online advertising can be summarized as()

A. reserved consent but discontent

B. objective analysis void of opinions

C. enthusiastic support but slight contempt

D. approval so far but uncertainty in the future

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