全部题库 / 英语(二) / 试题详情

单选题英语(二)

2021-02-18

Sir Walter Raleigh is a capitalist.

A．True

B． False

C． Not Given

查看答案及解析进入在线模考

参考答案

C

答案解析

原文未提及此内容。

你可能感兴趣的试题

1 The first settlers in Virginia were all male.

A．True

B． False

C． Not Given

查看解析在线模考

2 The living conditions of the first settlers were bad.

A．True

B． False

C． Not Given

查看解析在线模考

3 根据下面资料，回答题
Cells and Temperature
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the boundaries of effective functioning. Enzyme (酶) systems of mammals and birds are most efficient only within a narrow range around 37 ℃ ; a departure of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider fluctuations, the integrated actions of bodily systems are impaired. Other animals have a wider tolerance for changes of bodily temperature.
For centuries it has been recognized that mammals and birds differ from other animals in the way they regulate body temperatures. Ways of characterizing the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division into "warm-blooded" and "cold-blooded" species; warm-blooded included mammals and birds, whereas all other creatures were considered cold-blooded. As more species were studied, it became evident that this classification was inadequate. A fence lizard or a desert iguana (鬣蜥)--each cold-blooded--usually has a body temperature only a degree or two below that of humans and so is not cold. Therefore the next distinction was made between animals that maintain a constant body temperature, called homotherms (同温动物), and those whose body temperature varies with their environment,called poikilotherms (变温动物). But this classification also proved inadequate, because among mammals there are many that vary their body temperatures during hibernation. Furthermore, many invertebrates (无脊柱动物) that live in the depths of the ocean never experience a change in the chill of the deep water, and their body temperatures remain constant.
The current distinction is between animals whose body temperature is regulated chiefly by internal metabolic processes and those whose temperature is regulated by, and who get most of their heat from, the environment. The former are called endotherms (恒温动物), and the latter are called ectotherms (外温动物). Most ectotherms do regulate their body temperature,and they do so mainly by locomoting to favorable sites or by changing their exposure to external sources of heat. Endotherms ( mainly mammals and birds) also regulate their temperature by choosing favorable environments, but primarily they regulate their temperatures by making a variety of internal adjustments.
The passage mainly discusses______.

A．body temperatures of various animals

A．body temperatures of various animals

B．the newest research on measuring temperature

B． the newest research on measuring temperature

C．methods of temperature reduction

C． methods of temperature reduction

D．the classification of animals by temperature regulation

D．the classification of animals by temperature regulation

查看解析在线模考