| 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 switchyard. 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 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 A. have too many conflicting theories B. do not have enough funding to continue our research C. are not sure how the universe is put together D. have focused our investigations on the moon and planets [单项选择]We need to conduct extensive background research on the firms from （） we received bids.
A. which B. where C. that D. when [单项选择]As thus with thee in prayer in my sore need. O! Lift me as a wave, a leaf, a cloud! I fall upon the thorns of life! I bleed!The title of the work that contains the following selection is______.
A. The Second Coming B. To a Skylark C. Ode to the West Wind D. Don Juan [填空题]
Five Painful Facts You Need to Know 0. First of all, let’s set the record straight: Pain is normal. About 75 million U.S. residents endure chronic or recurrent pain. So what is pain and why do so many suffer so long Pain is felt when electrical signals are sent from nerve endings to your brain, which in turn can release painkillers called endorphins and generate reactions that range from instant and physical to long-term and emotional. Beyond that, scientific understanding gets painfully fuzzy. Here’s what’s known: 1. When you’re in pain, you know it. But if scientists could fully grasp how pain works and why, they might be able to help you more. The American Academy of Pain Medicine defines pain as "an unpleasant sensation and emotional response to that sensation." Some pain is the result of an obvious injury. Other times, it is caused by damaged nerves that are not so easy to pinpoint. "Pain is complex and defies our ability 我来回答: 提交
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