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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. 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
We drink more milk, eat more cream, cheese, butter than ever before. To meet and profit by this (61) demand for milk, dairy farmers have increased the (62) of their herds, they have (63) their grasslands more skillfully and have improved the quality of their stock. The average (64) of a cow in 1938 was 560 gallons at each lactation (哺乳期). Today it is well (65) 800 gallons.
The (66) of food given to a milking cow is (67) according to its weight and its yield. Sufficient energy, protein, minerals and vitamins must be fed to (68) the cow in good health and to replace (69) it loses in milk. A (70) supply of drinking water is essential. A cow will drink at (71) ten gallons a day and a (72) milker in hot weather may need as (73) as twenty-five gallons.
Cows are usually milked twice a day, early in the morning (74) in the late afternoon. Machine (75) is almost adopted
A. that
B. which
C. what
D. such
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