第一段中心句： “all that is needed for the triumph of a misguided cause is that good people do nothing.” 受錯誤思想引導的事業要想取得勝利只需好人袖手旁觀。(篇首的話在篇尾得到了呼應：“If good people do nothing, there is a real possibility that an uninformed citizenry will extinguish the precious embers of medical progress.”一首一尾的呼應突出了這篇文章的中心：呼喚科學家們采取行動，切勿讓人們的無知妨礙了醫學的發展。)

　　第二段中心句： Such well�瞞eaning people just don’t understand. 看，這樣善意的人們就是不明白道理。

　　第三段中心句： Scientists must communicate their message to the public in a compassionate, understandable way——in human term, not in the language of molecular biology. 科學家必須把他們的意思傳達給公眾，并且要使用善解人意和通俗易懂的語言，即大眾化的語言，而不要使用分子生物學的術語。

　　第四段中心句： Much can be done. 在這方面有很多事情可以做。

　　46. The author begins his article with Edmund Burke’s words to.

　　[A] call on scientists to take some actions

　　[B] criticize the misguided cause of animal rights

　　[C] warn of the doom of biomedical research

　　[D] show the triumph of the animal rights movement

　　47. Misled people tend to think that using an animal in research is.

　　[A] cruel but natural

　　[B] inhuman and unacceptable

　　[C] inevitable but vicious

　　[D] pointless and wasteful

　　48. The example of the grandmotherly woman is used to show the public’s.

　　[A] discontent with animal research

　　[B] ignorance about medical science

　　[C] indifference to epidemics

　　[D] anxiety about animal rights

　　49. The author believes that, in face of the challenge from animal rights advocates, scientists should.

　　[A] communicate more with the public

　　[B] employ hi�瞭ech means in research

　　[C] feel no shame for their cause

　　[D] strive to develop new cures

　　50. From the text we learn that Stephen Cooper is.

　　[A] a well�瞜nown humanist

　　[B] a medical practitioner

　　[C] an enthusiast in animal rights

　　[D] a supporter of animal research