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Passage Three 听材料，回答下列问题：
A.They havent devoted as much energy to medicine as to space travel.
B.There are too many kinds of cold viruses for them to identify.
C.It is not economical to find a cure for each type of cold.
D.They believe people can recover without treatment.
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TEXT 2 1.Even though they possess much more computing, bandwidth, and energy resources than mote-class sensors, mobile devices nevertheless face resource limitations. 2.Resource constraints in traditional sensor networks have been well studied. 3.However, MCS applications introduce new aspects in this regard. 4.First, the set of devices that are collecting sensor data are highly dynamic in availability and capabilities. 5.Due to this highly dynamic nature, modeling and predicting the energy, bandwidth requirements to accomplish a particular task is harder than traditional sensor networks. 6.Second, when there are a large number of available devices with diverse sensing capabilities, identifying and scheduling sensing and communication tasks among them under resource constraints is more complex. Source: Ganti, R. K., Ye, F. & Lei, H. (2011). Mobile crowdsensing: Current state and future challenges. IEEE Communications Magazine, 49 (11): 32-39.
B.They had closer relationships with the teachers．
C.They did better at word recognition and spelling
D.They had more talent in drawing．
下列各 Instinctively, the first thing we want to know about a disease is whether it is going to kill us. Twenty-five years ago, tiffs was the only question about AIDS we couJd anwer with any certainty; now, it is the only question we really camaot answer well at all. By now, those of us in the AIDS business long term have cared for thousands of patients. No one with that kind of personal experience can doubt for a moment the deadly potential of H. I. V. or the life-saving capabilities of the drugs developed against it. But there are also now htmdreds of footnotes and exceptions and modifications to those two facts that make the big picture ever murkier (扑朔迷离). We have patients scattered at every possible point: men and women who cruise on their medications with no problems at all, and those who never become stable on them and die of AIDS; those who refuse them until it is too late, and those who never need them at all; those who leave AIDS far behind only to die from lung cancer or breast cancer or liver failure, and those few who are killed by the medications themelves. So, when we welcome a new patient into our world, one whose fated place in this world is still unclear, and that patient asks us, as most do, whether this illness is going to kill him or not, it often takes a bit of mental stammering (口吃 ) before we hazard an answer,Now, a complete rundown of all the news from the front would take hours. The statistics change almost; hourly as new treatments appear. It is all too cold, too mathematical, too scary to dump on the head of a sick, frightened person. So we simplify. "We have good treatments now, we say. "You should do fine. " Once, not so long ago, we were working in another universe.Now we have simply rejoined the carnival (嘉年华) of modern medicine, noisy and encouraging, confusing and contradictory, fueled by the eternal balancing of benefits and risks. You can.win big, and why shouldnt you, with the usual fall-safe combination of luck and money. You have our very best hopes, so step right up: we sell big miracles but, offer no guarantees. What does the author say about AIDS？
A.It is definitely deadly twenty-five years ago.
B.The patients want to know everything about it.
C.We can answer anything about it with certainty now.
D.We could not answer questions about it well before.
B.He won three awards alter his death.
C.His plays were writ-ten based on his own life.
D.He was a victim of the American system.
A.is developed for 135 industry sectors of the Australian economy
B.is the first environmental protection organization developed by scientists
C.quantifies the environmental impact of ten social and financial indicators
D.helps keep sustainability of Australias economy, society and environment
A.urge children to follow all the rules in school
B.avoid childrens engagement in criminal activities
C.promote the development of childrens cognitive traits
D.have a greater effect on the non-cognitive traits of daughters
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