點擊查看：2019年6月六級閱讀理解模擬題匯總

　　英語六級閱讀理解全真模擬題(6)

　　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 moods and actions, our inclination to eat or drink, our aggressiveness or submissiveness, 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 glands 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 as a separate discipline can probably be traced to the experiments of Bayliss and Starling on the hormone secretion. This substance is secreted from cells in the intestinal walls when food enters the stomach; it travels through the bloodstream and stimulates the pancreas 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 could occur without participation of the nervous system.

　　The term “hormone” was first used with reference to secretion. Starling derived the term 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 secret products into the bloodstream. The term “endocrine” contrasts with “exocrine”, which is applied to glands that secret their products though ducts to the site of action. Examples of exocrine glands are the tear glands, the sweat glands, and the pancreas, which secrets pancreatic juice through a duct into the intestine. Exocrine glands are also called duct glands, while endocrine glands are called ductless.

　　1.What is the author’s main purpose in the passage?

　　A.To explain the specific functions of various hormones.

　　B.To provide general information about hormones.

　　C.To explain how the term “hormone” evolved.

　　D.To report on experiments in endocrinology.

　　2.The passage supports which of the following conclusions?

　　A.The human body requires large amounts of most hormones.

　　B.Synthetic hormones can replace a person’s natural supply of hormones if necessary.

　　C.The quantity of hormones produced and their effects on the body are related to a person’s age.

　　D.The short child of tall parents very likely had a hormone deficiency early in life.

　　3.It can be inferred from the passage that before the Bayliss and Starling experiments, most people believed that chemical integration occurred only___.

　　A.during sleep.

　　B.in the endocrine glands.

　　C.under control of the nervous system.

　　D.during strenuous exercise.

　　4.The word “l(fā)iberate” could best be replaced by which of the following?

　　A.Emancipate B.Discharge C.Surrender D.Save

　　5.According to the passage another term for exocrine glands is___.

　　A.duct glands

　　B.endocrine glands

　　C.ductless glands

　　D.intestinal glands.

　　第六篇答案：BDCBA

掃描/長按二維碼可幫助通過46級考試

獲取四六級報名時間

獲取四六級通關(guān)技巧

獲取精選四六級試題

獲取作文聽力等資料

四六級萬題庫 | 微信搜索"萬題庫英語四六級考試"

　　編輯推薦：

　　2019年6月大學(xué)英語六級詞匯看圖記憶匯總

　　2019年英語六級作文 | 2019年英語六級詞匯

　　2019年英語六級聽力 | 2019年英語六級翻譯

　　1995-2019英語六級作文真題及參考范文匯總

　　歷年大學(xué)英語六級考試真題聽力(含MP3)匯總

　　歷年大學(xué)英語六級考試真題及答案解析匯總

　　2019年英語四六級考試時間已確定(筆試+口語)