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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
Britain almost more than any other country in the world must seriously face the problem of building upwards, that is to say of accommodating a considerable proportion of its population in high blocks of fiats. It is said that the Englishman objects to this type of existence, but if the case is such, he does in fact differ from the inhabitants of most countries of the world today. In the past our own blocks of flats have been associated with the lower-income groups and they have lacked the obvious provisions, such as central heating, constant hot water supply, electrically operated lifts from top to bottom, and so on, as well as such details, important notwithstanding, as easy facilities for disposal of dust and rubbish and storage places for baby carriages on the ground floor, playgrounds for children on the top of the buildings, and drying grounds for washing. It is likely that the dispute regarding flats versus individual houses will continue to rage on for a long time as fa
A. do not have access to easy facilities because they live away from the city
B. have to pay a lot of money to employ people to do service work
C. take longer time to know each other because they are a scattered community
D. have to spend move money and time traveling to work every day
Health implies more than physical fitness. It also implies mental and emotional well-being. An angry, frustrated, emotionally (21) person in good physical condition is not (22) healthy. Mental health, therefore, bas much to do (23) how a person copes with the world as she/he exists. Many of the factors that (24) physical health also affect mental and emotional well-being.
Having a good self-image means that people have positive (25) pictures and good, positive feelings about themselves, about what they are capable (26) , and about the roles they play. People with good self-images like themselves, and they are (27) like others. Having a good self-image is based (28) a realistic (29) of one’s own worth and value and capabilities.
Stress is an unavoidable, necessary, and potentially healthful (30) of our society. People of all ages (31) stress. Children begin to (32) stress duri
A. sound
B. all round
C. entire
D. whole
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