正确答案:

题目：5′- 末端通常具有帽子结构的RNA分子是

解析：C

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举一反三的答案和解析：

[单选题]当宏观经济处于过热时期时，中央银行运用货币政策工具进行宏观调控的具体操作方式应该是( )。

降低购买有价证券必须支付的现金比率

解析：[分析]

[单选题]归纳和演绎思维方法的客观基础是

事物本身所固有的特殊和普遍的关系

[单选题]商品生产者要获得更多收益必须使生产商品的

个别劳动时间小于社会必要劳动时间

[单选题]

about

解析：答案为C。固定搭配，worry about 意为“担心...”。其它无此搭配。

[单选题]Text 2 To paraphrase 18th-century statesman Edmund Burke,“all that is needed for the triumph of a misguided cause is that good people do nothing.”One such cause now seeks to end biomedical research because of the theory that animals have rights ruling out their use in research. Scientists need to respond forcefully to animal rights advocates, whose arguments are confusing the public and thereby threatening advances in health knowledge and care. Leaders of the animal rights movement target biomedical research because it depends on public funding, and few people understand the process of health care research. Hearing allegations of cruelty to animals in research settings, many are perplexed that anyone would deliberately harm an animal. For example, a grandmotherly woman staffing an animal rights booth at a recent street fair was distributing a brochure that encouraged readers not to use anything that opposed immunizations, she wanted to know if vaccines come from animal research. When assured that they do, she replied,“Then I would have to say yes.”Asked what will happen when epidemics return, she said,“Don’t worry, scientists will find some way of using computers.”Such well-meaning people just don's understand. Scientists must communicate their message to the public in a compassionate, understandable way-in human terms, not in the language of molecular biology. We need to make clear the connection between animal research and a grandmother's hip replacement, a father's bypass operation a baby's vaccinations, and even a pet's shots. To those who are unaware that animal research was needed to produce these treatments, as well as new treatments and vaccines, animal research seems wasteful at best and cruel at worst.Much can be done. Scientists could“adopt”middle school classes and present their own research. They should be quick to respond to letters to the editor, lest animal rights misinformation go unchallenged and acquire a deceptive appearance of truth. Research institutions could be opened to tours, to show that laboratory animals receive humane care. Finally, because the ultimate stakeholders are patients, the health research community should actively recruit to its cause not only well-known personalities such as Stephen Cooper, who has made courageous statements about the value of animal research, but all who receive medical treatment. If good people do nothing there is a real possibility that an uninformed citizenry will extinguish the precious embers of medical progress.第46题：The author begins his article with Edmund Burke\'s words to

call on scientists to take some actions.

[单选题]Which of the following best summarizes the main idea of the passage?

A new mode of publication is emerging.

解析：正于28题分析的，本文中心介绍了一种出版新的趋势——网络出版。B正是这一观点的高度概括，故答案为B。