【原创】4月换题库后的所有jj汇总4.25 20：50

cooldar

Hey Jeff,

The elephant SC is in GWD-18-Q41

joy110211

以下是引用玻璃青橙在2007-4-23 21:44:00的发言：

是打不开!

能把文章和题目贴出来吗?

In most earthquakes the Earth’s crust cracks
                like
                porcelain. Stress builds up until a fracture forms at a depth of a few kilometers and the crust slips to relieve the stress. Some earthquakes, however, take place hundreds of kilometers down in the Earth’s mantle, where high pressure makes rock so ductile that it flows instead of cracking, even under stress severe enough to deform it like putty. How can there be earthquakes at such depths?
That such deep events do occur has been accepted only since 1927, when the seismologist Kiyoo Wadati convincingly demonstrated their existence. Instead of comparing the arrival times of seismic waves at different locations, as earlier researchers had done. Wadati relied on a time difference between the arrival of primary (P) waves and the slower secondary (S) waves. Because P and S waves travel at different but fairly constant speeds, the interval between their arrivals increases in proportion to the distance from the earthquake focus, or rupture point.
For most earthquakes, Wadati discovered, the interval was quite short near the epicenter, the point on the surface where shaking is strongest. For a few events, however, the delay was long even at the epicenter. Wadati saw a similar pattern when he analyzed data on the intensity of shaking. Most earthquakes had a small area of intense shaking, which weakened rapidly with increasing distance from the epicenter, but others were characterized by a lower peak intensity, felt over a broader area. Both the P-S intervals and the intensity patterns suggested two kinds of earthquakes: the more common shallow events, in which the focus lay just under the epicenter, and deep events, with a focus several hundred kilometers down.
The question remained: how can such quakes occur, given that mantle rock at a depth of more than 50 kilometers is too ductile to store enough stress to fracture? Wadati’s work suggested that deep events occur in areas (now called Wadati-Benioff zones) where one crustal plate is forced under another and descends into the mantle. The descending rock is substantially cooler than the surrounding mantle and hence is less ductile and much more liable to fracture.
1. The passage is primarily concerned with
(A) demonstrating why the methods of early seismologists were flawed
(B) arguing that deep events are poorly understood and deserve further study
(C) defending a revolutionary theory about the causes of earthquakes and methods of predicting them
(D) discussing evidence for the existence of deep events and the conditions that allow them to occur
(E) comparing the effects of shallow events with those of deep events
2. The author uses the comparisons to porcelain and putty (lines 2 and 8) in order to
(A) explain why the Earth’s mantle is under great pressure
(B) distinguish the earthquake’s epicenter from its focus
(C) demonstrate the conditions under which a Wadati-Benioff zone forms
(D) explain why S waves are slower than P waves
(E) illustrate why the crust will fracture but the mantle will not
3. It can be inferred from the passage that if the S waves from an earthquake arrive at a given location long after the P waves, which of the following must be true?
(A) The earthquake was a deep event.
(B) The earthquake was a shallow event.
(C) The earthquake focus was distant.
(D) The earthquake focus was nearby.
(E) The earthquake had a low peak intensity.
4. The method used by Wadati to determine the depths of earthquakes is most like which of the following?
(A) Determining the depth of a well by dropping stones into the well and timing how long they take to reach the bottom
(B) Determining the height of a mountain by measuring the shadow it casts at different times of the day
(C) Determining the distance from a thunderstorm by timing the interval between the flash of a lightning bolt and the thunder it produces
(D) Determining the distance between two points by counting the number of paces it takes to cover the distance and measuring a single pace
(E) Determining the speed at which a car is traveling by timing how long it takes to travel a known distance
5. The passage supports which of the following statements about the relationship between the epicenter and the focus of an earthquake?
(A) P waves originate at the focus and S waves originate at the epicenter.
(B) In deep events the epicenter and the focus are reversed.
(C) In shallow events the epicenter and the focus coincide.
(D) In both deep and shallow events the focus lies beneath the epicenter.
(E) The epicenter is in the crust, whereas the focus is in the mantle.

answer: CEACD

fionayan

LZ归纳的好仔细啊!!~~~没有重复的!!~~~~~~~~100个感谢!~~~~

真心祝福考到理想的分数~~~~~我也26号考~~~~~~~加油加油~~~

wei_wangyan

GWD-18-Q41

At the turn of the twentieth century, forest covering as much as 90 percent of Thailand and accommodating as many as 300,000 elephants, a third of them domesticated and performing various essential tasks.

 

1. covering as much as 90 percent of Thailand and accommodating as many as 300,000 elephants, a third of them
2. covering as much as 90 percent of Thailand accommodated as much as 300,000 elephants, and a third of them were
3. covered as much as 90 percent of Thailand and accommodated as much as 300,000 elephants, with a third
4. covered as much as 90 percent of Thailand and accommodated as many as 300,000 elephants, a third of them
5. covered as much as 90 percent of Thailand and accommodating as many as 300,000 elephants, with a third of them

祝LZ取得好成绩！

Jeffxf

谢谢！！大家一起加油！！

hgconnie

这题语法选D是吗？

同志们，偶脑袋现在一片糨糊了，太紧张。。。

crowkiller

以下是引用hgconnie在2007-4-24 11:20:00的发言：

这题语法选D是吗？

同志们，偶脑袋现在一片糨糊了，太紧张。。。

是的。

楼上的什么时候考啊？不要紧张。。。

推荐大家这个帖子：

http://forum.chasedream.com/dispbbs.asp?BoardID=34&ID=46513

hgconnie

我还有两天考。楼上的朋友。

现在脑袋比较空白。。。

crowkiller

嗬嗬，我明天北京考。

现在不用想太多了，考试的实力也不是这一两天能改变的，放松一下，看看电视。

考前在过一遍JJ 就好了。

加油，加油！！

hgconnie

好的。一起加油。

下午准备出去打个球什么的。