1971年联合国教科文组织制定了“人和生物圈”的研究计划，其目的_爱下问搜题

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问题选择题

1971年联合国教科文组织制定了“人和生物圈”的研究计划，其目的是( )

A．防止环境污染

B．控制人口数量

C．合理开发和利用自然资源

D．协调人与生物圈的关系

答案

答案：D

生物圈是地球上的所有生物与其生存的环境形成的一个统一整体．生物圈是人类和所有生物赖以生存的唯一家园．生物圈为生物的生存提供的必须的基本条件是营养物质、阳光、空气和水，还有适宜的温度和一定的生存空间．保护生物圈，人人有责．

人与生物圈计划，简称MAB，是联合国教科文组织科学部门于1971年发起的一项政府间跨学科的大型综合性的研究计划．生物圈保护区是MAB的核心部分，具有保护、可持续发展、提供科研教学、培训、监测基地等多种功能．其宗旨是通过自然科学和社会科学的结合，基础理论和应用技术的结合，科学技术人员、生产管理人员、政治决策者和广大人民的结合，对生物圈不同区域的结构和功能进行系统研究，并预测人类活动引起的生物圈及其资源的变化，及这种变化对人类本身的影响．“人与生物圈”的研究计划，其目的主要在于协调人与生物圈的关系．

故选D．

解答题

设定义域为R的函数f（x）满足：对于任意的实数x，y都有f（x+y）=f（x）+f（y）成立，且当x＞0时，f（x）＜0恒成立．
（1）判断f（x）的奇偶性及单调性，并对f（x）的奇偶性结论给出证明；
（2）若函数f（x）在[-3，3]上总有f（x）≤6成立，试确定f（1）应满足的条件；
（3）解x的不等式

f(ax)-f(a)（n是一个给定的正整数，a∈R）．

完形填空

One sunny afternoon, a seven-year-old girl went for a walk. She crossed a large area of grassland into the woods __31__ she realized that she was lost.
Sitting on a rock and __32__ what to do, she began crying. After a while, she__33__ to walk along a wide path lined with tall trees and thick bushes. __34__ it was getting dark, she saw a small, dark wooden house. She opened the door and __35__ stepped in. Suddenly, she heard a strange noise, and she ran out the door and back to the __36__. Cold and tired, she fell asleep near a __37__.
The girl’s parents were out and her dog, Laddy, was at home. Laddy __38__ that his Mistress was in danger. He jumped __39__ a window, breaking the glass. He looked in the fields. But he couldn't find his mistress anywhere. However, from the ground came a __40__ scent as he lowered his head. He __41__ the scent and walked across the grassland. Barking __42__ into the air, the dog __43__ through the woods until he found the __44__ . But the girl was not there, so he headed back to the woods. Much to his __45__ , he saw his mistress’ blue shirt in the distance. He __46__ over some bushes and saw the little stream, where the girl was __47__.
When she opened her eyes and 48 her dog standing beside her, the girl said, “you 49 me, Laddy,” and she kissed him several times. Seeing their daughter and dog coming back, the parents burst into tears of 50 . That night Laddy had a Hero's supper: a huge meal of steak.

C．remembering

D．unwillingly

A．satisfaction

B．disappointment

C．embarrassment