问题 选择题

读“木桶效应(组成木桶的木板如果长短不齐,那么这只木桶的盛水量,不取决于最长的那一块木板,而是取决于最短的)图”,回答题。

小题1:以某地的四类自然要素测得的各自所能供养的人口数量分别为:8000、10000、6000、4500,则该地的环境人口容量为

A.8000

B.10000

C.6000

D.4500小题2:本世纪初中国的人口数量(用a表示)、中国的合理人口容量(用b表示)、中国的环境人口容量(用c表示)三者的关系,正确的是                                                    

A.a<b<c

B.c<b<a

C.b<a<c

D.a<c<b

答案

小题1:D

小题2:C

题目分析:

小题1:根据材料“木桶效应”应该取决于四类自然要素测得的各自所能供养的人口数量中最小的,该地的环境人口容量为4500。

小题2:中国的合理人口容量(用b表示)大约为8亿—9亿;本世纪初中国的人口数量(用a表示)大约为12亿—13亿;中国的环境人口容量(用c表示)大约为16亿。

点评:本题难度适中。要求学生熟练掌握我国环境人口容量与人口合理容量。

单项选择题

As one works with color in a practical, or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile, changeable thing (1) to a large extent on the relationship of the color (2) other colors (3) simultaneously. It is not (4) in its relation to the direct stimulus which (5) it. On the other hand, the properties of surfaces that give (6) to color do not seem to change greatly under a wide variety of illumination color, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to be (7) in large part to the mechanism of color (8) .

When the eye is (9) to a colored area, there is an immediate readjustment of the (10) of the eye to color in and around the area (11) . This readjustment does not promptly affect the color seen but usually does affect the next area to which the (12) is shifted. The longer the time of viewing, the higher the (13) , and the larger the area, the greater the effect will be (14) its persistence in the (15) viewing situation. As indicated by the work of Wright and Schouten, it appears that, at (16) for a first approximation, full adaptation takes place over (17) time if the adapting source is moderately bright and the eye has been in (18) darkness just previously. Also, (19) of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become (20) over the whole eye.

8()

A.assimilation

B.admission

C.regulation

D.adaptation

单项选择题