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  3. 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 d

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 d

admin2007-12-11  50
问题     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 don’t know about the way the universe is put together. But we do know exacdy 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 switchyard(调车场). All of the switches(转辙器) 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 if we can see the setting of a switch; we can say with confidence that some possible futures will not materialize and others will. At the unseen switches, however, there is no such certainty. We know the train will take one of the tracks leading out, but we have no idea which one. The unseen switches are the true decision points in the future, and what happens when we arrive at them determines the entire subsequent course of events.
    When we think about the future of the universe, we can see our "track" many billions of years into the future, but after that there are decision points to be dealt with and possible fates to consider. The goal of science is to reduce the ambiguity at the decision points and find the true road that will be followed.
For whom is the author probably writing this passage?
选项 A、Train engineers.
B、General audiences.
C、Professors of statistics.
D、Young children.
答案B
解析 推断题。通观全文，文章主要讲未来的发展很多是我们不可知的。不可能是对火车工程师或统计学教授讲的，对小孩来说又太抽象难懂了，所以只有可能是写给普通大众的。
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