og14讨论

wangyu73cn

以下是引用sensornet在2005-5-6 4:03:00的发言：
请问各位第82题，
82. The author states that the research described in the first paragraph was undertaken in order to
在第一段里我没找到research呀。请问哪个是？

A meteor stream is composed of dust particles that have been ejected from a parent comet at a variety of velocities. These particles follow the same orbit as the parent comet, but due to their differeing velocities they slowly gain on or fall behind the disintegrating comet until a shroud of dust surrounds the entire cometary orbit. Astronomers have hypothesized that a meteor stream should broaden with time as the dust particles’ individual orbits are perturbed by planetary gravitational fields. A recent computer-modeling experimetn tested this hypothesis by tracking the influence of planetary gravitation over a projected 5,000-year period on the positions of a group of hypothetical dust particles. In the model, the particles were randomly distributed throughout a computer simulation of the orbit of an actual meteor stream, the Geminid. The researcher found, as expected, that the computer-model stream broadened with time. Coventional theories, however, predicted that the distribution of particles would be increaingly dense toward the center of a meteor stream. Surpringly, the computer-model meteor stream gradually came to resemble a thick-walled, hollow pipe.

以上是第一段。从黑体字部分可知，the research应是A recent computer-modeling experiment.

sensornet

The OG I got before seems decouples the whole first paragraph exactly from "Astronomers ....". So, then I understand.

Thank you, Wangyu!

danlon77

86题OG的解释简直是匪夷所思！

“The best answer is C. According to the passage, the Geminid meteor shower occurs yearly;

because meteor showers occur whenever the Earth passes through a meteor stream, one can infer

that the Earth crosses the Geminid stream once every year.”

我想做这题唯一的线索是：

“Has the predicted twin-peaked activity been observed

for the actual yearly Geminid meteor shower?”

我做两遍都错在这题上，根本没看到yearly。并且题面“orbits the Sun”跟太阳有什么关系呀？

wangyu73cn

地球每年绕太阳一圈，在围绕太阳运行的一圈的过程中，会碰到一次G流行雨。

richard-ma

以下是引用danlon77在2005-6-6 18:08:00的发言：

86题OG的解释简直是匪夷所思！

“The best answer is C. According to the passage, the Geminid meteor shower occurs yearly;

because meteor showers occur whenever the Earth passes through a meteor stream, one can infer

that the Earth crosses the Geminid stream once every year.”

我想做这题唯一的线索是：

“Has the predicted twin-peaked activity been observed

for the actual yearly Geminid meteor shower?”

我做两遍都错在这题上，根本没看到yearly。并且题面“orbits the Sun”跟太阳有什么关系呀？

我也是看了OG后还是不明白，看样子这里ETS给下了个圈套。

snowjing

A meteor stream is composed of dust particles that have been ejected from a parent comet at a variety of velocities. These particles follow the same orbit as the parent comet, but due to their differeing velocities they slowly gain on or fall behind the disintegrating comet until a shroud of dust surrounds the entire cometary orbit.
Astronomers have hypothesized that a meteor stream should broaden with time as the dust particles’ individual orbits are perturbed by planetary gravitational fields. A recent computer-modeling experimetn tested this hypothesis by tracking the influence of planetary gravitation over a projected 5,000-year period on the positions of a group of hypothetical dust particles. In the model, the particles were randomly distributed throughout a computer simulation of the orbit of an actual meteor stream, the Geminid. The researcher found, as expected,
that the computer-model stream broadened with time. Coventional theories, however, predicted that the distribution of particles would be increaingly dense toward the center of a meteor stream. Surpringly, the computer-model meteor stream gradually came to resemble a thick-walled, hollow pipe.
Whenever the Earth passes through a meteor stream, a meteor shower occurs. Moving at a little over 1,500,000 miles per day around its orbit, the Earth would take, on average, just over a day to cross the hollow, computer-model Geminid stream if the stream were 5,000 years old. Two brief periods of peak meteor activity during the shower would be observed, one as the Earth entered the thick-walled “pipe” and one as it exited.
There is no reason why the Earth should always pass through the stream’s exact center, so the time interval between the two bursts of activity would vary from one year to the next.
Has the predicted twin-peaked activity been observed for the actual yearly GEminid meteor shower? The Geminid data between 1970 and 1979 show just such a bifurcation, a secondary burst of meteor activity being clearly visible at an average of 19 hourse (1,200,000 miles) after the first burst. The time intervals between the bursts suggest the actual Geminid stream is about 3,000 years old.

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请问highlight这句话到底表明是不是pass through the stream's exact center, 从理解上看应该是的.但如果穿过exact center, 为何每次间隔时间还要变呢?

这篇文章就是这里还有点疑惑,请大家帮忙解释一下.谢谢

forgmat66

80.

This question asks you to identify the primary focus of the passage.

The best answer is B. The author describes the new theoretical model in the first paragraph; in the

final paragraph the author states that the data obtained from actual observations, which are

discussed in the second and third paragraphs, is consistent with the new theoretical model.

Choice A is not correct; the computer model confirmed the astronomers’ hypothesis that meteor

streams broaden with time, and although the model yielded an unexpected result, the passage does

not contrast the predictions yielded by competing theories. Choice C and D are not correct because

the passage makes no reference to further areas for research, and only a single phenomenon is

described in the passage. And choice E is not correct because it reverses the order of events. The

model yielded a prediction that was subsequently confirmed by observational data, the model was

not constructed to explain the data.

1， 请 问 黄 色 部 分 ， 是 修 饰 谁 的 呢 ？ 我 怎 么 觉 得 只 有 最 后 一 段 讲 的 是 实 际 观 察 ， 前 面 讲 的 是 模 型 出 来 的 结 果 呢 ？

2， 还 有 选 项 A的 问 题 有 人 说 这 里 没 对 比 。 那 是 不 是 只 是 证 实 的 关 系 呢 ？ 而 且 这 里 存 在 两 个 理 论 吗 ？

多 谢

楼 上 的 MM， 我 认 为 你 说 那 句 话 的 理 解 是 它 并 不 一 定 每 次 都 从 中 心 过 ， 所 以 需 要 时 间 不 等 。

[此贴子已经被作者于2005-9-8 10:39:09编辑过]

brissa

以下是引用danlon77在2005-6-6 18:08:00的发言：

86题OG的解释简直是匪夷所思！

“The best answer is C. According to the passage, the Geminid meteor shower occurs yearly;

because meteor showers occur whenever the Earth passes through a meteor stream, one can infer

that the Earth crosses the Geminid stream once every year.”

我想做这题唯一的线索是：

“Has the predicted twin-peaked activity been observed

for the actual yearly Geminid meteor shower?”

我做两遍都错在这题上，根本没看到yearly。并且题面“orbits the Sun”跟太阳有什么关系呀？

同问，象我这样的白痴不知道地球每年绕太阳一圈的，这题就做不出来了。ETS不是应该不带背景知识的考察嘛？

forgmat66

有 没 有 “orbits the Sun” 理 解 应 该 是 一 样 的 吧 ？ ！

fuyun

以下是引用forgmat66在2005-9-8 10:31:00的发言：

80.

This question asks you to identify the primary focus of the passage.

The best answer is B. The author describes the new theoretical model in the first paragraph; in the

final paragraph the author states that the data obtained from actual observations, which are

discussed in the second and third paragraphs, is consistent with the new theoretical model.

Choice A is not correct; the computer model confirmed the astronomers’ hypothesis that meteor

streams broaden with time, and although the model yielded an unexpected result, the passage does

not contrast the predictions yielded by competing theories. Choice C and D are not correct because

the passage makes no reference to further areas for research, and only a single phenomenon is

described in the passage. And choice E is not correct because it reverses the order of events. The

model yielded a prediction that was subsequently confirmed by observational data, the model was

not constructed to explain the data.

1， 请 问 黄 色 部 分 ， 是 修 饰 谁 的 呢 ？ 我 怎 么 觉 得 只 有 最 后 一 段 讲 的 是 实 际 观 察 ， 前 面 讲 的 是 模 型 出 来 的 结 果 呢 ？

2， 还 有 选 项 A的 问 题 有 人 说 这 里 没 对 比 。 那 是 不 是 只 是 证 实 的 关 系 呢 ？ 而 且 这 里 存 在 两 个 理 论 吗 ？

多 谢

楼 上 的 MM， 我 认 为 你 说 那 句 话 的 理 解 是 它 并 不 一 定 每 次 都 从 中 心 过 ， 所 以 需 要 时 间 不 等 。

两个理论参见18-22。Conventional theories, however...........