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More than two centuries after Benjamin Franklin used one to study lightning, a team of atmospheric scientists has found that kites are a potent research tool for studying air conditions at high altitudes.
Ben Balsley and John Briks at the University of Colorado have developed a kite and instrument package to sample the atmosphere up to 3.5 kilometers high, for up to two days at a time. The kite is cheaper and more flexible than balloons and aircraft, the traditional vehicles for atmospheric research. Within two years the team expects to fly kites up to 10 kilometers high, and Briks hopes to use these to measure carbon dioxide and methane emissions over the Brazilian rainforest and the transport of air pollutants over the Atlantic Ocean.
The kite is a 15-square-meter Para foil made of Mylar, which ’is not only strong, but unlike nylon, Joes not absorb water. The kite "string" is made of Kevlar, famous for its use in bullet-proo
A. the strength of the wind
B. air traffic conditions
C. the power requirements of the equipment
D. the movability of the TRAM
Text 1
More than two centuries after Benjamin Franklin used one to study lightning, a team of atmospheric scientists has found that kites are a potent research tool for studying air conditions at high altitudes.
Ben Balsley and John Briks at the University of Colorado have developed a kite and instrument package to sample the atmosphere up to 3.5 kilometers high, for up to two days at a time. The kite is cheaper and more flexible than balloons and aircraft, the traditional vehicles for atmospheric research. Within two years the team expects to fly kites up to 10 kilometers high, and Briks hopes to use these to measure carbon dioxide and methane emissions over the Brazilian rainforest and the transport of air pollutants over the Atlantic Ocean.
The kite is a 15-square-meter Para foil made of Mylar, which ’is not only strong, but unlike nylon, Joes not absorb water. The kite "string" is made of Kevlar, famous for its use in bullet-proo
A. Kites have been found to be a useful tool in research on air conditions
B. Balloons and aircraft are traditional tools in research on air conditions
C. C .The kites can now fly up to 10 kilometers high
D. The kites are expected to fly higher and do more researches in the near future
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More than one in ten people who are regularly exposed to organophosphate pesticides(有机磷酸脂农药) will suffer unrecoverable physical and mental damage, a team of psychiatrists warns. The investigators say that theirs is the first serious attempt to estimate the number of people suffering because of chronic low-level exposure to the pesticides.
"This is a worrying high level of illness," says one researcher. The findings by the researcher, who also treats many of the victims, conflict with those of the Britain’s government agency monitoring occupational health, which says there is no good evidence to suggest chronic exposure leads to widespread illness. The research team sent questionnaires to 400 farmers selected at random from a phone book. Of 179 who replied, 130 reported that they had been exposed to organophosphates. And 21 farmers complained of enough symptoms to be classed as suffering from organophosphate poisoning. Allowing for bia
A. Whether exposure to organophosphate will do any harm to man
B. Whether chronic exposure to organophosphate would lead to widespread illness
C. Whether it is worthwhile to find out the number of people suffering from organophosphate poisoning
D. Whether organophosphate is a good pesticide
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