用标志重捕法来估计某个种群的个体数量,例如在对某种鼠群的种群密度的调查中,第一次捕获

题型:单项选择题

问题:

用标志重捕法来估计某个种群的个体数量,例如在对某种鼠群的种群密度的调查中,第一次捕获并标志39只,第二次捕获34只,其中有标志鼠15只,则对该种群的数量估计,哪一项是不正确的()

A.该种群数量可用N表示

B.该种群数量大约为88只

C.该种群数量大约为100只

D.N=39×34÷15

考点:高中生物种群和群落种群和群落题库
题型:单项选择题

下列人员中,属于期货公司高级管理人员的是()。

A.监事会 * *

B.独立董事

C.董事长

D.营业部负责人

题型:单项选择题

正畸治疗中牙周组织损害的好发部位是()

A.后牙及下颌前牙

B.上颌中切牙

C.上颌侧切牙

D.上下颌前牙

E.上下颌后牙

题型:单项选择题

下列说法中,符合γ-氨基丁酸的是

A.它是一种必需氨基酸

B.由谷氨酸脱氢酶催化的产物

C.由脑中谷氨酸脱羧生成的

D.它是神经兴奋性传递物质

E.天冬氨酸脱羧生成

题型:单项选择题

1985年5月11日,国务院颁布了《旅行社管理暂行条例》,这是我国第一部旅游行业的行政法规。在这部法规中,按照()不同,旅行社被划分为一类、二类、三类旅行社。

A.管理职能

B.企业规模

C.企业性质

D.经营业务范围

题型:单项选择题

Part 1


·Read thefollowingpassage, eight sentences have been removed from the article.
·Choose from the sentences A-H the one whichfits each gap.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
·Do not mark any letter twice.
The single, decisive factor that made it possible for mankind to settle in permanent communities was agriculture. (1) Once people could control the production of food and be assured of a reliable annual supple of it, their lives changed completely.
Fanning was a revolutionary discovery. (2) With more food available, more people could be fed. Populations therefore increased. The growing number of people available for more kinds of work led to the development of more complex social structures. (3)
Farming the world over has always relied upon a dependable water supply. For the earliest societies this meant rivers and streams or regular rainfall. (4) Later communities were able to develop by taking advantage of the rainy seasons.
All of the ancient civilizations probably developed in much the same way, in spite of regional and climatic differences. (5) Heavier pottery replaced animal-skin gourds as containers for food and liquids. Cloth could be woven from wool and flax. Permanent structures made of wood, brick, and stone could be erected.
The science of mathematics was an early outgrowth of agriculture. People studied the movements of the moon, the sun, and planets to calculate seasons. (6) With a calendar it was possible to calculate the arrival of each growing season. Measurement of land areas was necessary if property was to be a factor in farming and housekeeping. (7) All of the major ancient civilizations in Mesopotamia, Egypt, the Indus Valley, and China emerged in the 4th millennium BC. Historians still debate over which one emerged first. It may well have been the Middle East, in an area called the Fertile Crescent. This region stretches from the Nile River in Egypt northward along the coast of former Palestine, then eastward into Asia to include Mesopotamia. (8) This kind of larming depended on the reproduction of seed, normally from grain crops.
A. It not only made settlements possible and ultimately the building of cities but it also made available a reliable food supply.
B. Later came measures of value as commodity and money exchange became common.
C. In this area people settled along the riverbanks and practiced field agriculture.
D. After farming was developed in the Middle East in about 6500 BC, people living in tribes or family units did not have to be on the move continually searching for food or herding their animals.
E. As villages grew, the accumulation of more numerous and substantial goods became possible.
F. With a food surplus, a community could support a variety of workers who were not farmers.
G. The first great civilizations grow up along rivers.
H. In doing so they created the first calendars.

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