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 report in Nature, in a paper published online in advance, that a greater number of individual households, 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 required its own plumbing, cooking and refrigeration. "In larger households, the efficiency of resource consumption will be a lot higher, because more people share things", Dr. Liu said. He and his colleagues looked at the population patterns of life in 141 countries, including 76 "hotspot" regions unusually rich in a variety of endemic wildlife. These hot spots included Australia, New Zealand, the US, Brazil, China, India, Kenya, and Italy. They found that between 1985 and 2000 in the "hotspot" parts of the globe, the annual 3.1% growth rate in the number of households was far higher than the population growth rate of 1.8%. "Had the average household" size remained at the 1985 level", the scientists report, "there would have been 155m fewer households in hotspot countries in 2000. Paradoxically, smaller households do not mean smaller homes. In Indian River County, Florida, the average area of a one-storey, single family house increased 33% in the past three decades". Dr. Liu"s work grew from the alarming discovery that the giant pandas living in China"s Wolong reserve were more at risk now than they were when the reserve was first established. The local population had grown, but the total number of homes had increased more swiftly, to make greater inroads into the bamboo forests. Gretchen Daily of Stanford, one of the authors, said: "We all depend on open space and wild places, not just for peace of mind but for vital services such as crop pollination, water purification and climate stabilization. The alarming thing about this study is the finding that, if family groups continue to become smaller and smaller, we might continue losing biodiversity—even if we get the aggregate human population size stabilized".
A．Smaller Households, Larger Damage.B．Wildlife, Also Right to Live.C．Soaring Population, Rising Hazard to Wildlife.D．Environmental Pollution, Enormous Threat to Wildlife.
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使用无菌手套的操作，错误的是A.戴无菌手套的手，不可接触非无菌物品B.戴前应核对手套号
使用无菌手套的操作，错误的是A.戴无菌手套的手，不可接触非无菌物品B.戴前应核对手套号码和灭菌日期C.手套有污迹，应先用清水冲净，再脱下浸泡D.手套戴好后，两手置于腰以上、视线范围以内区域E.无菌手套破损时，要及时更换
A.戴无菌手套的手，不可接触非无菌物品B.戴前应核对手套号码和灭菌日期C.手套有污迹，应先用清水冲净，再脱下浸泡D.手套戴好后，两手置于腰以上、视线范围以内区域E.无菌手套破损时，要及时更换
B.戴前应核对手套号码和灭菌日期C.手套有污迹，应先用清水冲净，再脱下浸泡D.手套戴好后，两手置于腰以上、视线范围以内区域E.无菌手套破损时，要及时更换
C.手套有污迹，应先用清水冲净，再脱下浸泡D.手套戴好后，两手置于腰以上、视线范围以内区域E.无菌手套破损时，要及时更换
D.手套戴好后，两手置于腰以上、视线范围以内区域E.无菌手套破损时，要及时更换
E.无菌手套破损时，要及时更换
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