The planet’s wild creatures face a new threat -- from yuppies, empty nesters, singletons and one parent families. Biologists studying the pressure on the planet’s dwindling biodiversity today report on a new reason for alarm. Although the rate of growth in the human population is decreasing, the number of individual households is exploding. Even where populations have actually dwindled -- in some regions of New Zealand, for instance -- the number of individual households has increased, bemuse of divorce, career choice, smaller families and longer lifespans.
Jianguo Liu of Michigan State University and colleagues from Stanford University in California re- port in Nature, in a paper published online in advance, that a greater number of individual house-holds, each containing on average fewer people, meant more pressure on natural resources. Towns and cities began to sprawl as new homes were built. Each household needed fuel to heat and light it; each household r
A. tropical, zones.
B. places of scenic beauty.
C. areas with high population density.
D. regions rich in a variety of creatures.
T1 | T2 | T3 |
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A.启动变速箱 B.静液压变速箱 C.静液压泵 D.通风机 [简答题]示范条款如何解决了“高保低赔”问题?
[判断题]网络舆论的是是非非,种种表现,一言难尽。但是,有一点是可以肯定的,那就是爱国主义是网络舆论的永恒强音和绝对主流
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