该题作为排除型题十分特殊，因为答案已经十分明确地在录音内容中表明而无需逐一排除其他选项。答案的对应录音内容是Cloning is the process of creating living organisms which are genetic copies of each other, through means other than sexual reproduction，其中最后的 other than sexual reproduction 的意思就是除了 sexual reproduction以外，这与选项B 完全对应。

[重点难点]
理解other than有排除的意思。

[录音原文]
Passage Four
Cloning is the process of creating living organisms which are genetic copies of each other, through means other than sexual reproduction. In simpler terms, cloning refers to the development of offsprings that are genetically identical to their parents. Just imagine, you could get a twin by cloning yourself. Parents who lose their children to death may get tempted to clone their dead child. Some may think of cloning Einstein and giving rise to a league of superhumans.
While cloning is often referred to as an unnatural process, it occurs quite often in nature. Identical twins are clones, for example, and asexual creatures are reproduced by cloning. Artificial human cloning, however, is both very new and complex. It is scary to many because no one knows if the clone will develop similar capabilities to its master clone, which is the purpose of artificial human cloning.
Is artificial cloning safe? Not yet. It took 277 unsuccessful embryo implantations to produce Dolly the Sheep in 1996. Apparently healthy at birth, Dolly was stricken with arthritis and lung cancer at an early age and had to be put down in 2003. Since Dolly, other animals have been subjected to cloning procedures with success, and have been found to always have abnormal organs.
But now comes news that biologists have turned mature animal cells into a special stem cell called "Totipotent". Stem cells can be grown to produce human organs. Totipotent is the most versatile of stem cells. It can develop into, any organ, such as an embryo, and hence give rise to a fully formed animal — in other words, a clone.
If so, the implications are huge. It promises an almost ridiculously simple route to regenerative medicine, which is studied and used in. treating conditions such as brain injury and type-1 diabetes, and is at the early stage of research for treatments of stroke, heart attack and hearing loss.

该题相对简单，因为正确选项C 在录音中有直接对应的内容： It is scary to many because...(只是把cloning根据前文替换成了代词）。选项A 和 B 虽然在录音中也有提及，但都不是问题所问的克隆让很多人害怕的原因。选项D 则在录音中没有出现相关信息。

[重点难点]
记住why问题，抓住because之后的解释。

该题正确选项没有在录音内容中直接体现，而是通过两处信息间接表现， 即… produce Dolly the Sheep in 1996 和 Dolly ... and had to be put down in 2003 这两点。解题需要清楚录音内容所用的produce在克隆动物这个语境中与(give)birth等同，而 put down在此语境下是kill的委婉表达方式。选项A 没有抓住录音内容中的 关键词unsuccessful，而选项B 把 Dolly很早得了关节炎说成了出生就有关节炎，因此 A 和 B 都不正确，这也同时决定包含A 和 B 的D 也是错误的。

[重点难点]
抓住1996年与2003年之间的时间变化（ seven years )，理解put down 在此语境下的意思。

正确答案选项D 在录音中有直接对应的内容，只是录音中把Totipotent根据 上文改换成了代词（ It can develop into any organ )，所以属于难度较低的问题。选 项 A 说的是Totipotent可以发展为成熟的动物细胞，而录音有关信息是生物学家把 成熟的动物细胞变成了叫做Totipotent的特殊干细胞。选项B 把干细胞可以发展为人体器官说成了不能发展为人体器官。选项C 使用了 faster—词，而原录音中没有与快慢相关的信息。

[重点难点]
把握主题词及其代词替换，明确肯定性与否定性词语。

正确答案为选项A，在录音中有直接对应，即 which is studied and used in treating conditions such as brain injury。选项 B 在录音中没有提及。选项 C、D 在录音中虽然有所提及，但前面有一个共同的限定性短语说只是在初级阶段，即 at the early stage of research for treatments of，所以都不是问题的答案。

[重点难点]
抓住对应信息，利用细节排除错误选项。