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 tracks leading out, but we have n
A. They tell us which one of the tracks the universe will use.
B. They enable us to alter the course of universe.
C. They give us information about the lunar surface.
D. They determine which course the universe will take in the future.
Conditions were near perfect as parachutist Elizabeth Cheshire jumped from the twin-engine plane at 10,000 feet. The 22-year-old daughter of a war-time hero, Elizabeth had 60 jumps behind her.
The weather was fine and the wind was well below the 10 mph (miles per hour) maximum allowed for jumping.
Free-falling with eight other members of her parachute club, Elizabeth watched the Cambridge shire countryside spread out beneath her. At 2,000 feet she opened her parachute. Seconds later she had the most terrifying experience of her life. At 800 feet and right on target for the landing zone, a massive gust of wind picked her up and swept her away from the airfield near Pampisford Village. As she fought with the parachute strings to get back on course, a main road and lines of trees loomed up before her. Using every ounce of strength she managed to clear them. But then came the moment of horror. She saw herself heading straight for three 11,000 volt electrical power tin
A. Elizabeth was not at all experienced in parachute jumping.
B. Elizabeth jumped from the twin-engine plane all by herself.
C. The wind was a bit strong when Elizabeth jumped out.
D. It was by sheer luck that Elizabeth escaped death.
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