[简答题]The threat from global warming, he reports, "Is very real. It is only a matter of time before the temperature of the surface of the Earth becomes uncomfortable warm. What can we do Well frankly, I don’t believe we’ll ever be able to supply our power needs by simple devices such as windmills. I think the restriction of emissions of greenhouse gases will require the building of nuclear power stations in many places. The single most important development would be if there were some agreement on world population, because global warming will depend intrinsically on how much energy is consumed." "But one of the reasons why the human population is growing so fast -- it is unlikely to stop this side of eight billion is precisely because we opted out of natural selection."

[简答题]The threat from global warming, he reports, "Is very real. It is only a matter of time before the temperature of the surface of the Earth becomes uncomfortable warm. What can we do Well frankly, l don’t believe we’ll ever be able to supply our power needs by simple devices such as windmills. I think the restriction of emissions of greenhouse gases will require the building of nuclear power stations in many places. The single most important development would be if there were some agreement on world population, because global warming will depend intrinsically on how much energy is consumed."
"But one of the reasons why the human population is growing so fast -- it is unlikely to stop this side of eight billion
is precisely because we opted out of natural selection./

[填空题]According to scientists possible threat from nanomaterials may cause some severe problems.

[填空题]The threat of a global outbreak of bird flu makes it urgent for the international
community to cooperate effectively. Wealthy countries will have to provide
hundreds of millions of dollars for the testing and production of medicines
unnecess ary for treating patients suffering from bird flu. Developing countries, (1) ______
particularly in Southeast Asia, which the bird flu virus has spread since 1997, must (2) ______
work out special programs so that farmers will not hide signs of possible
out-breaks. However, the way such farm birds as chickens and ducks are traditionally (3) ______
raised and marketed in the developed world should be changed; there should (4) ______
be more distance between the birds and their keepers. Countries should deal in (5) ______
the disease with joint effort.
The potential effects of a national breakout of bird flu are enormous. Firstly
, the breakout may kill lar

[填空题]The Badlands were rocky, dry and dusty from the very beginning.