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[Issue Essay]

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题目:

Analytical!

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答案:

提问:

Years before the advent of plate tectonics―the widely accepted theory, developed in the mid-1960's, the holds that the major features of Earth's surface are created by the horizontal motions of Earth's outer shell, or lithosphere―a similar theory was rejected by the geological community. In 1912, Alfred Wegener proposed, in a widely debated theory that came to be called continental drift, that Earth's continents were mobile. To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document, containing several of the essential presumptions underlying plate tectonics theory: the horizontal mobility of pieces of Earth's crust; the essential difference between oceanic and continental crust; and a causal connection between horizontal displacements and the formation of mountain chains. Yet despite the considerable overlap between Wegener's concepts and the later widely embraced plate tectonics theory, and despite the fact that continental drift theory presented a possible solution to the problem of the origin of mountains at a time when existing explanations were seriously in doubt, in its day Wegener's theory was rejected by the vast majority of geologists. Most geologists and many historians today believe that Wegener's theory was rejected because of its lack of an adequate mechanical basis. Stephen Jay Gould, for example, argues that continental drift theory was rejected because it did not explain how continents could move through an apparently solid oceanic floor. However, as Anthony Hallam has pointed out, many scientific phenomena, such as the ice ages, have been accepted before they could be fully explained. The most likely cause for the rejection of continental drift―a cause that has been largely ignored because we consider Wegener's theory to have been validated by the theory of plate tectonics―is the nature of the evidence that was put forward to support it. Most of Wegener's evidence consisted of homologies―similarities of patterns and forms based on direct observations of rocks in the field, supported by the use of hammers, hand lenses, and field notebooks. In contrast, the data supporting plate tectonics were impressively geophysical―instrumental determinations of the physical properties of Earth garnered through the use of seismographs, magnetometers, and computers. 我选了E considerable overlap前面是despite XXX说明这个是个成就,他和后面的反对W的观点的事情是相反的。所以感觉D说用这个词的目的是解释为啥W理论。请老师辨析DE!谢谢!

解答:

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阅读269909
解答: 张慧雯

提问:

r/t=2? 条件1:点(r,t)在(0,y)和(x,0)这条直线上,x和y不记得了 条件2:点(r,t)过(0,4)和(3,6)

解答:

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解答: sysadmin老师

提问:

K P M是三个正整数,问KP+M是奇数吗? 条件1:KM+P是奇数 条件2:PM+K是偶数

解答:

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阅读248201
解答: sysadmin老师

提问:

DS:x/a+y/b=1,求该直线与x轴的交点? 条件1:b=3 条件2:a=b

解答:

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阅读248158
解答: sysadmin老师

提问:

PS:m,p都是正整数,p是质数。x2-mx+p=0这个方程的根是正数。求m-p的值? 选项有1,2,4之类。

解答:

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阅读248457
解答: sysadmin老师

提问:

DS:有12个人给老师买礼物,每个人至少出一块钱,总共出的钱是否不少于30 条件1:有一半的人至少出3块钱 条件2:4个人出的钱至少是出钱最少的人出的钱的5倍

解答:

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阅读248461
解答: sysadmin老师

提问:

DS:定义F(n)=n/k的余数,问K>10? 条件1:F(n+32)=6 条件2:F(n+42)=8

解答:

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阅读248728
解答: sysadmin老师

提问:

PS:一个国家telephone exchange numbers有七个digits,但前三个digits都是一样的数字,例都是932打头。问至少需要多少个数字(minimum required number)可以组成282000个telephone exchange numbers? 选项是:三个2十几的数字和两个2百几的数字。

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解答: sysadmin老师

提问:

DS:a,b,c,d互不相等,(a-c)/(b-d)=a/b吗? 条件1:a/b=c/d 条件2:(a+c)/(b+d)=a/b

解答:

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阅读248684
解答: sysadmin老师

提问:

PS:the value of (4^8 - 8^16)/(2^12 – 4^16)

解答:

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阅读248479
解答: sysadmin老师

提问:

PS:讲一个租赁汽车的公司每一次购买会购买5辆新车,每次卖掉会卖掉3辆旧车,今年新增了14辆车,把每次买和每次卖都算做一次交易,问今年最少做了几次交易?

解答:

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解答: sysadmin老师

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