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【单选题】
根据下面材料,回答题。 It is predicted that there will be 5 scientific breakthroughs in the 21st century. We'll know where we came from. Why does the universe exist? To put it another way, why is there something instead of nothing? Since the 1920s, scientists have known the universe is expanding, which means it must have started at a definite time in the past. They even have developed theories that give a detailed picture of the evolution of the universe from the time it was a fraction of a second old to the present. Over the next couple of decades, these theories will be refined by data from extraordinary powerful new telescope. We will have a better understanding of how matter behaves at the unfathomably high temperatures and pressures of the early universe. We'll crack the genetic code and conquer cancer. In 19th century operas, when the heroine coughs in the first act, the audience knows she will die of tuberculosis in Act 3. But thanks to 20th century antibiotics, the once dreaded, once incurable disease now can mean nothing more serious than taking some pills. As scientists learn more about the genetic code and the way cells work at the molecular level, many serious diseases——cancer, for one- will become less threatening. Using manufactured 'therapeutic' viruses, doctors will be able to replace cancer causing damaged DNA with healthy genes, probably administered by a pill or injection. We'll live longer (120 years?) If the normal aging process is basically a furious, invisible contest in our cells- a contest between damage to our DNA and our cells ability to repair that damage- then 21st century strides in genetic medicine may let us control and even reverse the process. But before we push scientists to do more, consider: Do we really want to live in a world where no one grows old and few children are born because the planet can hold only so many people? Where would new ideas come from? What would we do with all that extra time? We'll 'manage' Earth. In the next millennium, well stop talking about the weather but will do something about it. Well gradually learn how to predict the effects of human activity on the Earth,its climate and its ecosystems. And with that knowledge will come an increasing willingness to use it to manage the workings of our planet. We'll have 'a brain road map'. This is the real 'final frontier' of the 21st century: The brain is the most complex system we know. It contains about 100 billion neurons (roughly the number of stars in the Milky Way), each connected to as many as 1,000 others. Early in the next century, we will use advanced forms of magnetic resonance imaging to produce detailed maps of the neurons in operation. We'll be able to say with certainty which ones are working when you read a word, when you say a word, when you think about a word, and so on. The sentence 'In 19th century operas, when the heroine coughs in the first act, the audience knows she will die of tuberculosis in Act 3' means__________. 查看材料
A.
there was not antibiotics at that time
B.
tuberculosis was a terrible disease that couldn't be cured during 19th century
C.
the health of the heroine was very poor
D.
this was a common situation in the 19th century operas
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【简答题】答えを書き入れてください。
【多选题】在《结构力学(上)》中,我们学习了固定荷载作用下静定的( )的求解。
A.
梁和刚架
B.
C.
桁架与组合结构
D.
排架
【单选题】有关糖浆剂说法,错误的是
A.
糖浆剂的含糖量应为 45% ( g/ml )以上
B.
单糖浆可作矫味剂、助悬剂
C.
单糖浆浓度高、渗透压大,可抑制微生物生长
D.
糖浆剂为高分子溶液
【单选题】根据投资的风险分散理论,以等量资本投资于A、B两个项目,则下列表述正确的有( )。
A.
如果A、B两个项目完全正相关,组合后的风险完全抵消
B.
如果A、B两个项目完全正相关,组合后的风险既不扩大也不减少
C.
如果A、B两个项目完全负相关,组合后的风险完全抵消
D.
如果A、B两个项目完全负相关,组合后的风险既不扩大也不减少
【多选题】根据投资的风险分散理论,以等量资本投资于A、B两个项目,则下列表述正确的有( )。
A.
如果 A 、B两个项目完全正相关,组合后的风险完全抵消
B.
如果A、B两个项目完全正相关,组合后的风险既不扩大也不减少
C.
如果A、B两个项目完全负相关,组合后的可分散风险完全抵消
D.
如果A、B两个项目完全负相关,组合后的风险既不扩大也不减少
【单选题】公认的摄影术的发明人是法国人( )。
A.
尼埃普斯
B.
拿破仑
C.
达盖尔
D.
路易十四
【单选题】太平天国后期担任军事指挥的青年将领
A.
杨秀清、石达开
B.
萧朝贵、冯云山
C.
陈玉成、李秀成
D.
石达开、韦昌辉
【多选题】根据投资的风险分散理论,以等量资本投资于E、F两个项目,那么( )。
A.
如果E、F两个项目完全正相关,组合后的风险完全抵消
B.
如果E、F两个项目完全正相关,组合后的风险既不扩大也不减少
C.
如果E、F两个项目完全负相关,组合后的非系统风险完全抵消
D.
如果E、F两个项目完全负相关,组合后的风险既不扩大也不减少
【简答题】\t甲、乙两名消防监督员到某高级宾馆进行消防监督抽查,该宾馆设有火灾自动报警、自动喷水灭火系统等消防设施。\t请结合案例,分析并回答以下问题:\t1.测试自动喷水灭火系统的湿式报警阀的工作状况时,开启试水闸阀后,水力警铃长时间不响,原因可能是什么?\t2.试说明检查自动喷水灭火系统工作状况有效性的方法。\t3.检查消防控制室,测试某楼层火灾探测器,消防控制室没有信号反馈,请分析可能的原因。\t4....
【多选题】根据投资的风险分散理论,以等量资本投资于E、F两个项目,那么( )。
A.
如果 E 、F两个项目完全正相关,组合后的风险完全抵消
B.
如果E、F两个项目完全正相关,组合后的风险既不扩大也不减少
C.
如果E、F两个项目完全负相关,组合后的风险完全抵消
D.
如果E、F两个项目不相关,组合后的风险既不扩大也不减少
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