皮皮学,免费搜题
登录
搜题
【单选题】
If there is one thing scientists have to hear, it is that the game is over. Raised on the belief of an endless voyage of discovery, they recoil (畏缩) from the suggestion that most of the best things have already been located. If they have, today' s scientists can hope to contribute no more than a few grace notes to the symphony of science. A book to be published in Britain this week, The End of Science, argues persuasively that this is the case. Its author, John Horgan, is a senior writer for Scientific American magazine, who has interviewed many of today's leading scientists and science philosophers. The shock of realizing that science might be over came to him, he says, when he was talking to Oxford mathematician and physicist Sir Roger Penrose. The End of Science provoked a wave of denunciation (谴责) in the United States last year. 'The reaction has been one of complete shock and disbelief,' Mr. Horgan says. The real question is whether any remaining unsolved problems, of which there are plenty, lend themselves to universal solutions. If they do not, then the focus of scientific discovery is already narrowing. Since the triumphs of the 1960s--the genetic code, plate tectonics (板块构造税), and the microwave background radiation that went a long way towards proving the Big Bang--genuine scientific revolutions have been scarce. More scientists are now alive, spending more money on research, than ever. Yet most of the great discoveries of the 19th and 20th centuries were made before the appearance of state sponsorship, when the scientific enterprise was a fraction of its present size. Were the scientists who made these discoveries brighter than today's? That seems unlikely. A far more reasonable explanation is that fundamental science has already entered a period of diminished returns. 'Look, don't get me wrong,' says Mr. Horgan. 'There are lots of important things still to study, and applied science and engineering can go on for ever. I hope we get a cure for cancer, and for mental disease, though there are few real signs of progress.' The sentence 'most of the best things have already been located' could mean ______ .
A.
most of the best things have already been changed
B.
most of the best things remain to be changed
C.
there have never been so many best things waiting to be discovered
D.
most secrets of the world have already been discovered
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【单选题】在专业的抗原递呈细胞中,最有效的抗原递呈细胞是( )。
A.
巨噬细胞
B.
树突状细胞
C.
B淋巴细胞
D.
血管内皮细胞
E.
脑组织的小胶质细胞
【简答题】影响人力资源数量的因素
【多选题】关于抗原递呈细胞,下列描述正确的是( )
A.
专业APC细胞表面表达MHCI类分子
B.
树突状细胞(DC)是目前所知功能最强、最有效的APC
C.
能够显著刺激初始T细胞增殖是树突状细胞(DC)最大的特点
D.
巨噬细胞,B细胞只能刺激已活化的或记忆性T细胞
【判断题】流体的密度与0°C一个标准大气压下水的密度的比值称为相对密度。
A.
正确
B.
错误
【简答题】( )的设立,标志着西餐业正式登陆中国
【判断题】树突状细胞是专业的抗原递呈细胞。
A.
正确
B.
错误
【单选题】在专业的抗原递呈细胞中,( )是最有效的抗原递呈细胞。
A.
巨噬细胞
B.
树突状细胞
C.
自然杀伤细胞
D.
中性粒细胞
【判断题】国家机关对建设工程合同管理中有执法权。( )
A.
正确
B.
错误
【多选题】影响人力资源数量的因素是指
A.
人口总量
B.
人口年龄结构
C.
人口迁移
D.
身体素质
E.
智力
【多选题】影响人力资源数量的因素
A.
人口总量
B.
人口的年龄构成
C.
再生产状况
D.
人口迁移
相关题目: