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单选题英语四级

2017-05-19

Up to now, Cook's studies have not shown any evidence of side effects.

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参考答案

K

答案解析

题干意为，到目前为止，库克的研究尚未显示任何副作用的证据。注意抓住题干中的关键信息Cook、evidence of side effects。K段最后提到，……她的研究至今从未发现存在任何副作用的证据。由此可知，题干是对原文的同义转述，故答案为K。

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3 Questions are based on the following passage.
Without regular supplies of some hormones our capacity to behave would be seriously impaired; without others we would soon die. Tiny amounts of some hormones can modify our moods and our actions, our inclination to eat or drink, our aggressiveness or submissiveness (顺从., and our reproductive and parental behavior. And hormones do more than influence adult behavior; early in life they help to determine the development of bodily form and may even determine an individual's behavioral capacities. Later in life the changing outputs of some
endocrine ( 内分泌.glands (腺体.and the body's changing sensitivity to some hormones are essential aspects of the phenomena of aging.
Communication within the body and the consequent integration of behavior were considered the exclusive province of the nervous system up to the beginning of the present century. The emergence of endocrinology (内分泌学.as a separate discipline can probably be traced to the experiments of Bayliss and Starling on the hormones
secreting. This substance is secreted from cells in the intestinal (肠的.walls when food enters the stomach; it travels through the bloodstream and stimulates the pancreas (胰.to liberate pancreatic juice, which aids in digestion. By showing that special cells secret chemical agents that are conveyed by the bloodstream and regulate distant target organs or tissues, Bayliss and Starling demonstrated that chemical integration can occur without participation of the nervous system.
The term "hormone" was first used with reference to secreting. Starling derived the word from the Greek hormone, meaning "to excite or set in motion". The term "endocrine" was introduced shortly thereafter. "Endocrine" is used to refer to glands that secrete products into the bloodstream. The term "endocrine" contrasts
with "exocrine (外分泌.）which is applied to glands that secrete their products through ducts (导管.to the site of action. Examples of exocrine glands are the tear glands, the sweat glands, and the pancreas, which secretes pancreatic juice through a duct into the intestine. Exocrine glands are also called duct glands, while endocrine glands are called ductless glands.
The author's main purpose in this passage is to ____.

A．explain the specific functions

B．provide general information about hormones

C．explain how the term "hormone" evolved

D．report on experiments in endocrinology

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