We are going to have the TV fixed.A.preparedB.mendedC.cleanedD.arranged
We are going to have the TV fixed.
A.prepared
B.mended
C.cleaned
D.arranged
We are going to have the TV fixed.
A.prepared
B.mended
C.cleaned
D.arranged
A.Wish them a happy journey.
B.May they have a more comfortable home.
C.They are really going to be missed.
D.We can't stay together forever, can we?
A.Wish them a happy journey.
B.May they have a more comfortable home.
C.They are really going to be missed.
D.We can't stay together forever, can we?
A.legal application of the method
B.the way to obtain a DNA sample
C.work yet to be done about DNA fingerprinting
D.possible danger in drawing a DNA sample from the human body
?? One ofthe most mysterious archaeological spectacles in the world is the immensecomplex of geo- metrical symbols, giant ground-drawings of birds and animals,and hundreds of long, ruler-straight lines , some right across mountains, which stretch over l,200 square miles of the Peruvian tablelands, atNazca.
?? Nazcawas first revealed to modern eyes in 1926 when three explorers looked dow??n onthe desert from a hillside at dusk and briefly saw a Nazca line highlighted bythe rays of the sun. But it was not until the Peruvian airforce took aerialphotographs in the 1940s that the full magnificence of the pano- rama wasapparent. Hundreds of what looked like landing strips for aircraft wererevealed. There were eighteen bird-like drawings, up t0 400 feet long;four-sided figures with two lines parallel; and long needle-like triangleswhich ran for miles. Among the many abstract patterns were a giant spider, a monkey,a shark all drawn on the ground on a huge scale.
?? Thescale is monumental, but from the ground almost invisible and totallyincomprehensible. The amaz- ing fact about Nazca, created more than l,500 yearsago, is tha??t it can only be appreciated if seen from the air. Many, therefore,regarded it as a prehistoric landing ground for visitors from outer space, butJim Wood- man, an American explorer, who was long fascinated by the mystery ofNazca, had a different opinion. He be- lieved that Nazca only made sense if thepeople who had designed and made these vast drawings on the ground couldactually see them, and that led him to the theory that the ancient Peruvianshad somehow learned to fly, as only from above could they really see the extentof their handiwork. With this theory in mind, he researched into ancientPeruvian legends about flight and came to the conclusion that the only feasibleanswer was a hot- air balloon.
?? To provehis theory, Woodman would have to make such a thing using the same fabrics andfibers that would have?? been available to the men of Nazca at the time. Hestarted by gathering information from ancient paintings, legends, books andarchaeological sites. After many attempts, Woodman built a balloon-typeairship. It took him into the air, letting him have the sensation he had neverhad from viewing the same ground that he had seen many times. His flight was amodern demonstration of an ancient possibility.??
?? One of the "most mysterious archaeologicalspectacles in the world" is??
A.the size of Nazca
B.the lines over mountains
C.the Peruvian tablelands
D.the huge and complicated ground-drawings
A.open
B.out of order
C.disengaged
D.in use
A.demanded
B.suggested
C.insisted
D.orderedV
?? Evenwith the best will in the world,reducing our carbon emissions is not going toprevent global warming. It has become clear that even if we take the moststrong measures to control emissions, the uncertainties in our climate modelsstill leave open the possibility of extreme warming and rises in sea level. Atthe same time,resistance by governments and special interest groups makes itquite possible that the actions suggested by climate scientists might not beimplemented soon enough.??
?? Fortunately,if the worst comes to the worst,scientists still have a few tricks up their sleeves. For the most part theyhave strongly resisted discussing these options for fear of inviting a sense ofcom- placency that might thwart efforts to tackle the root of the problem.Until now, that is. A growing number of researchers are taking a fresh look atlarge-scale "geo-engineering" projects that might be used tocounteract global warming. "I use the analogy of methadone," saysStephen Schneider,a cli- mate researcher at StanfordUniversity in California who was among the first to drawattention to global warming. "If you have a heroin addict, the correcttreatment is hospitalization,and a long rehab. But if they absolutelyrefuse,methadone is better than heroin. "????
?? Basically the ide??a is to apply "sunscreen" to the wholeplanet. One astronomer has come up with a radical plan to cool Earth;launchtrillions of feather-light discs into space, where they would form. a vast cloudthat would block the sun's rays. It's controversial,but recent studies suggestthere are ways to deflect just enough of the sunlight reaching the Earth'ssurface to counteract the warming produced by the greenhouse effect. Globalclimate models show that blocking just l. 8 per cent of the incident energy inthe sun's rays would cancel out the warming effects produced by a doubling ofgreenhouse gases in the atmosphere. That could be crucial,because even the mostsevere emissions-control meas- ures being proposed would leave us with a doublingof carbon dioxide by the end of this century,and that would last for at least acentury more.??????
??According to the first two paragraphs, theauthor thinks that ________??
A.strong measures have been taken by the government to prevent global warming
B.to reduce carbon emissions is all impossible mission
C.despite the difficulty, scientists have some options to prevent global warming
D.actions suggested by scientists will never be realized
A.know what they are doing
B.feel their efforts are useless
C.think the problem has been solved
D.see the real problem
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