Passage One
All that we really need to plot out the future of our universe are a few good measurements. This does not mean that we can sit down today and outline the future course of the universe with anything like certainty. There are still too many things we do not know about the way the universe is put together. But we do know exactly what information we need to fill in our knowledge, and we have a pretty good idea of how to go about getting it.
Perhaps the best way to think of our present situation is to imagine a train coming into a switch yard(调车场). All of the switches are set before the train arrives, so that its path is completely determined. Some Switches we can see, others we cannot. There is no ambiguity (不明确) if we can see the setting of a switch; we can say with confidence that some possible futures will not materialize (实现) and others will. At the unseen switches, however, there is no such certainty. We know the train will take one of the trac
A. A statement illustrated by an analogy.
B. A hypothesis supported by documentation.
C. A comparison of two contrasting theories.
D. A critical analysis of a common assumption.
Passage One
We develop our impressions of other countries and their people through books, movies, television, magazines, fellow students, and friends. But is there really any substitute for first-hand experience
Come, spend a summer studying in the USA, and get to know people and a land which are incredibly rich in their variety. You may end up on an urban campus or a rural one, at a small school or a large one, in a cool climate or a warm one, in San Francisco or St. Louis. But whatever your experience, it will be first-hand, personal, alive, and unforgettable!
If you spend a summer studying in the USA, you’ll have advantages which the tourist never will. Not only will you learn the subject matter of your choice, but you’ll gain an understanding of the American educational system as well. You’ll experience the culture of the people and the dynamics of your physical environment. But above all, as a student you’ll have a chanc
A. outside the place where you study
B. outside the United States
C. who will ask you to stay longer in the USA
D. who will continue to keep in touch with you after you return to your own country
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