[填空题]According to the scientists it is the emission of CO(₂ by human beings that causes the increases of CO₂ levels.

[填空题]According to the scientists it is the emission of CO(₂ by human beings that causes the increases of CO₂ levels.

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

[简答题]According to scientists, many people believe that physical cleanliness is strongly linked to ______.

[单项选择]According to scientists, to keep down concentrations of greenhouse gases, we should______.
A. stop gas emissions
B. lower the temperature
C. reduce the use of coal, oil, and gas
D. cut off the use of coal, oil, and gas

[单项选择]According to some scientists, Hemps are preferable to trees chiefly because
A. they are more easily cultivated.
B. they have been cultivated by many cultures for a long time.
C. they can produce more paper than trees.
D. they can provide more endurable fibers than trees.

[单项选择]According to the passage, scientists have decided that sulfur aerosols from volcanic eruptions affect global temperatures to a greater extent than ash clouds because
A. the greenhouse gas effect produced by human activities tends to have a much greater environmental effect than that of volcanic explosions
B. clouds of sulfur-rich gases tend to achieve greater heights in the stratosphere than do ash clouds
C. a particular explosion producing high sulfur and little ash had a greater environmental effect than the converse
D. the burning of fossil fuels tends to exacerbate the effects of sulfurous aerosols, but not those of ash clouds
E. global warming effects tend to minimize the impact of ash clouds, but not those of sulfurous aerosols

[填空题]According to German scientists, a vaccine for avian flu H5N1 will be available in ______.

[填空题]According to many scientists, solar energy will be used（）(extend) in the 21 st century.

[简答题]

According to the new school of scientists, technology is an overlooked force in expanding the horizons of scientific knowledge. Science moves forward , they say, not so much through the insights of great men of genius as because of more ordinary things like improved techniques and tools. In short, a leader of the new school contends , the scientific revolution, as we call it, was largely the improvement and invention and use of a series of instruments that expanded the reach of science in innumerable direction.
Over the years, tools and technology themselves as a source of fundamental innovation have largely been ignored by historians and philosophers of science. The modern school that hails technology argues that such masters as Galileo, Newton, Maxwell, Einstein, and inventors such as Edison attached great importance to, and derived great benefit from, craft information and technological devices of different kinds that were usable in scientific experiments