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It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought. However, all that is visible of the constituents of the Milky Way’s corona (outer edge), where much of the galaxy’s mass must be located, is a tiny fraction of the corona’s mass. Thus most of the Milky Way’s outlying matter must be dark.

Why? Three facts are salient. First, dwarf galaxies and globular clusters, into which most of the stars of the Milky Way’s corona are probably bound, consist mainly of old stars. Second, old stars are not highly luminous. Third, no one has detected in the corona the clouds of gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy. At present, therefore, the best explanation-though still quite tentative-for the darkness of the corona is that the corona is composed mainly of old, burned-out stars.
The passage as a. whole is primarily concerned with
Quantum mechanics is a highly successful’ theory: it supplies methods for accurately calculating the results of diverse experiments, especially with minute particles. The predictions of quantum mechanics, however, give only the probability of an event, not a deterministic statement of whether or not the event will occur. Because of this probabilism, Einstein remained strongly dissatisfied with the theory throughout his life, though he did not maintain that quantum mechanics is wrong. Rather, he held that it is incomplete: in quantum mechanics the motion of a particle must be described in terms of probabilities, he. Argued, only because some parameters that determine the motion have not been specified. If these hypothetical “hidden parameters” were known, a fully deterministic trajectory could be defined. Significantly, this hidden- parameter quantum theory leads to experimental predictions different from those of traditional quantum mechanics. Einstein’s ideas have been tested by experiments performed since his death, and as most of these experiments support traditional quantum mechanics, Einstein’s approach is almost certainly erroneous.
It can be inferred from the passage that the author’s conclusion that Einstein’s approach is “erroneous” might have to be modified because
Although she gives badly (i)_____titles to her musical compositions, they (ii)_____ unusual combinations of materials including Gregorian chant, Asian scale patterns and rhythms, electronic sounds, and bird songs.
Even though the folktales Partout collected and retold were not solely French in origin, his versions of then were so decidedly French in style that later anthologizes of French folktales have never _____ them
In arguing against assertions that environmental catastrophe is imminent, her book does not ridicule all predictions of doom but rather claims that the risks of harm have in many cases been_____.
There seems to be no(i)_____ the reading public’s thirst for books about the 1960’s: indeed, the normal level of interest has(ii)_____recently because of aspiration of popular television documentaries.
Despite a tendency to be overtly_____, the poetry of the Middle Ages often sparks the imagination and provides lively entertainment, as well as pious sentiments.
One of the first _____ of reduced burning in Amazon rain forests was the chestnut industry: smoke tends to drive out the insects that, by pollinating chestnut tree,allow chestnuts to develop.
The research committee urged the archaeologist to (i)_____her claim that the tomb she has discovered was that of Alexander the Great since her initial report has been based only on(ii)_____.
The scientist found it puzzling that his theory encountered (i)_____ despite widespread agreement that it was (ii)_____
The rate at which soil can absorb water (i)_____ with continuous wetting, so the longer a (ii)_____ lasts, or the greater the rate of precipitation, the higher the percentage of water that will flow across the ground as runoff and enter stream channels.
The ideas expressed in the art historian’s book are more(i)_____than one would expect on the basis of her rather (ii)_____ treatment of her subject in the opening pages.
The meeting on environmental issues produced(i)_____discussion but no commitment on a plan of action: the many uncertainties surrounding global climatic change and the huge cost of efforts to limit it made the policymakers(ii)_____.
Art that endures often makes an initially disturbing impact: the profound experience that such art seeks to provoke necessarily engenders a certain_____.
The history of film reflects the_____. inherent in the medium itself: film combines still photographs to represent continuous motion and, while seeming to present life itself, can also offer impossible and dreamlike unrealities.
The(i)_____with which the politician peppers her speeches are so memorable that many people think of her as being far more (ii)_____ than she in fact is.
Although Heron is well known for the broad comedy in the movies she has directed previously, her new film is less inclined to_____: the gags are fewer and subtler.
Bebop’s legacy is(i)_____ one: bebop may have won jazz the right to be taken seriously as an art form, but it(ii)_____ jazz’s mass audience, which turned to other forms of music such as rock and pop.

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