单项选择题

A．dust
B．dead human skin
C．quill-coverts
D．fluff
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Traveling VS. Reading In the first part of your writing you should present your thesis statement, and in the second part you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural conclusion or a summary. Marks will be awarded for content, organization, grammar and appropriacy. Failure to follow the above instructions may result in a loss of marks. Write your essay on ANSWER SHEET FOUR.
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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.
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