[D] develop a theory that account for the role played by peptide hormonesin the brain.
4. Which of the following is mentioned in the text as a drawback of theimmunological method of detecting peptide hormones?
[A] It cannot be used to detect the presence of growth regulators in thebrain.
[B] It cannot distinguish between the peptide hormones and substancesthat are very similar to them.
[C] It uses antiserums that are unable to cross the blood-brain barrier.
[D] It involves a purification process that requires extensive trainingin endocrinology.
5. The idea that the field of endocrinology can gain from developments inmolecular biology is regarded by Roberts with
[A] incredulity.
[B] derision.
[C] indifference.
[D] enthusiasm.
[答案与考点解析]
1. 【答案】D
【考点解析】这是一道中心主旨题。全文从头至尾讨论的是peptide hormones在人体内产生的部位,所以有关全文中心主旨内容的答案应该包含peptide hormones。从各段的主题句进行分析,第一至四段主要讲如何detect肽激素所产生的位置,第五段主要讲有关肽激素的function。可见本题的正确选项应该是D。考生在解题时一定要搞清楚原文所涉及的对象并且抓住每段的主题句以及它们之间的相互关系。
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