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【单选题】

Task 2
Directions: This task is the same as Task 1.The 5 questions or unfinished statements are numbered 41 through 45.
Say goodbye to the Mountain Gorilla.Say farewell to the Short Tailed Chinchilla.
That's the conclusion of the United Nations Environment Program's (UNEP) Third Global Environmental Outlook Report.The report was compiled (编写) for the UN from the work of 1 100 scientists.It predicts the state of the planet in the year 2032 based on the policies and practices of the last 30 years.If these continue, UNEP says, we're going to be living on a very lonely planet.By 2032, one quarter of the world's mammal species (哺乳动物种群) will disappear.They will be joined by 12% of the world's bird species.And according to UNEP, 5 611 species of plants will also be wiped out-but since only 4% of the world's plant species have been examined in detail, that figure will probably be much higher.
UNEP blames a variety of causes, from poverty and overpopulation to pollution, global warming and profit-driven economic and trade policies.But there is some good news.There has been an 85% reduction in the use of chemicals, for instance.And around 10% of the earth's suce is in protected areas like national parks, five times as much as 30 years ago.
'We can never know for certain what lies before us,' said a UNEP official.'The future is another country.But we can see how our actions or lack of actions might shape the environment and the inhabitants
(居民) of this extraordinary blue planet by 2032.'
At the beginning of the passage, 'Mountain Gorilla' and 'Short Tailed Chinchilla' seem to be some ______.

A.
mountains
B.
animals
C.
rivers
D.
sceneries
题目标签:种群
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参考解析:
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刷刷题刷刷变学霸
举一反三

【多选题】集合种群所描述的动态、斑块、局域种群等正确的是()

A.
种群过小会导致近交衰退,即使环境再好也无用
B.
集合种群动态:指人为干扰使生物的栖息地片段化,斑块生境下的种群变化
C.
集合种群的空间尺度:一个物种所占据的整个地理区域,一般个体不会扩散出该区域
D.
在刚刚破碎化的栖息地中生存的种通常不具备一个集合种群的功能,因为这时个体也许只有很弱的迁移能力,因而这样的种很易灭绝

【单选题】下列属于在种群水平上研究的问题是[ ]

A.
种群种类的多少
B.
种群密度的大小
C.
群落中的优势种群和劣势种群
D.
种群的空间分布及其相互关系

【单选题】有关种群概念正确的是()

A.
居住在同一个区域
B.
同种个体
C.
同一个环境
D.
以上全部正确

【单选题】下列关于种群的叙述中不正确的是()。

A.
理想条件下,种群数量增长的数学模型是N t =Nλ t
B.
器械捕杀和药物捕杀是控制家鼠等有害动物的根本措施
C.
调查某种昆虫卵的密度和作物植株上蚜虫的密度可采用样方法
D.
利用性引诱剂诱杀害虫可改变害虫种群的性别比例使种群密度下降