The sun is much _________(far) than the moon from Earth._百度作业帮
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The sun is much _________(far) than the moon from Earth.
The sun is much _________(far) than the moon from Earth.当前位置：
＞＞＞Science has told us so much about the moon that it is quite ..
Science has told us so much about the moon that it is quite easy to form an idea of what it would be like to go there. It is certainly not a friendly place. As there is no air or water, there can be no life of any kind. Mile after mile there are only plains(平原) of dust with mountains around them. Above, the sun and stars shine in the black sky. If you step out of the mountains shadows, it will mean moving from terrible cold into great heat. The moon is also a very silent(安静的) world, for sound waves (声波)can only travel through air. But from the moon, you can see a friendly sight(景色). Our earth is shining more brightly than the stars. It looks like a large ball, coloured blue and green and brown. (&&&) 16.What kind of place is the moon?A. It is a friendly place.&&&&&&&&&&&& B. It is a lively place.C. It is a nice place for man to live.&&& D. It is a lifeless place.( &&&) 17.Temperatures on the moon____.A. are usually the same everywhere&&&B. Are always very lowC. can be very different&&&&&&&&&&&&& D. are usually very high( &&&) 18.The moon is a silent world because____.A. there is no life there&&&&&&&&&&&&& B. there is no air there C. there is no water there&&&&&&&&&&&& D. there is not a green tree there(&&&) 19. When we look from the moon, the sky is ____.blue&&&&&&&&& B. black&&&&&&&& C. green&&&&&&&&&& D. brown(&&) 20. Mile after mile there are only plains of dust with mountains around them. The word “dust” means “___”.A. dump (垃圾堆)&&& B. dry earth (泥土)&&& C. land&&&&&& D. field
题型：阅读理解难度：中档来源：不详
16-20 DCBBB1.&从文章的句子：As there is no air or water, there can be no life of any kind.可知月球上没有生命。选D。2.&&&&&&从文章的句子：If you step out of the mountains shadows, it will mean moving from terrible cold into great heat.可知月球上的温度很不一样。选C。3.&&&&&&从文章的句子;The moon is also a very silent(安静的) world, for sound waves (声波)can only travel through air.可知是月球上没有空气。选B。4.&&&&&&从文章的句子;Above, the sun and stars shine in the black sky.可知答案是B。5.&&&&&&从所在的句子看，dust是泥土的意思。选B
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据魔方格专家权威分析，试题“Science has told us so much about the moon that it is quite ..”主要考查你对&&健康环保类阅读，科教类阅读&&等考点的理解。关于这些考点的“档案”如下：
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因为篇幅有限，只列出部分考点，详细请访问。
健康环保类阅读科教类阅读
健康环保类阅读：本类型主要是围绕饮食健康、医疗卫生及环境保护等方面选取实际的材料来设题。体裁有记叙文、说明文、议论文和各种应用文。 健康环保类阅读题答题注意事项和技巧：应试生态环保类题目时，在理解文章的基础上，要重点突破——归纳主旨大意技能，因为推断是以整体理解为基础的推断能力。1.归纳主旨大意： (1)寻找具体段落的中心思想的方法是：找出每小段的主题句。主题句通常有这样的特点：①有一个话题(topic)；②有阐述控制性概念，偶尔也可在一段中间；③有的文章无明显主题句，主题句隐含在段意之中。这就需要读者进一步加工概括了。 (2)寻找整篇文章的中心思想的方法建立在寻找具体段落中心的基础上的。 应观察全文的结构安排，理解文章浓墨重笔写的“重心”，考虑文章组织材料及支撑性细节是服务于什么的，分析故事的发展结局都是围绕什么中心大意来安排的。 (3)典型错误：①忽视文章的结构；②混淆了中心与支撑细节或材料的区别；③忽视文章表意的倾向性；④漏掉了主要的特征词。 2.正确推理判断： 推理判断试题要求考生尽量考虑文中全部信息或事实，在通篇理解文章的基础上领会作者的言外之意，并作出正确的推理和判断。 (1)数据推断题 解答此类题，关键是要善于捕捉有关数字的信息，然后在透彻理解原文的字面意义和题意的基础上，运用自己的数学知识，对其进行分析、推算，从而得出正确的结论。 (2)知识推断题 根据文章中所阐述的细节，运用基础知识进行分析、推敲，从而得出符合文章原义的结论的一种推断方法。 (3)逻辑结论推断题 根据事实、论点、例证等一系列论据材料，不是根据自己的经验、态度、观点或爱好去理解文章的内涵。解答这类题的前提是要首先获得短文的主题思想或列举的具体事实，然后按题意要求进行推断。 (4)对作者态度、倾向的推断题 作者的倾向和感情往往隐含在文章的字里行间，或流露于修饰的词语之中，因此，在推断过程中，应特别注意文中作者的措辞。科普类的阅读：科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。如果是介绍社会现象的文章，要掌握所谈现象的内涵。答题技巧：1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和&& 关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。 2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。 3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。
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出门在外也不愁From Wikipedia, the free encyclopedia
In this article, the
according to
romanization.
"Moon letter" redirects here. For the adaptation of the Roman alphabet into tactile form, see .
Sun letters (red) and moon letters (black)
are divided into two groups, called the sun letters or solar letters (: ???? ?????? ?urūf shamsiyya) and moon letters or lunar letters (???? ????? ?urūf qamariyya), based on whether or not they
the letter lām ( l) of a preceding definite
(???). These names come from the fact that the word for 'the sun', al-shams, pronounced ash-shams, assimilates the lām, while the word for 'the moon', al-qamar, does not.
When followed by a sun letter, the // of the Arabic definite article al- assimilates to the initial consonant of the following noun, resulting in a . For example, for "the Nile", one does not say al-Nīl, but an-Nīl. When the definite article is followed by a moon letter, no assimilation takes place. The sun letters represent the
according to the phonology of Classical Arabic, and the moon letters represent all others.
The sun and moon letters are as follows:
Sun letters
Moon letters
The letter
jīm is pronounced differently depending on the region of the speaker, representing a coronal consonant such as [] or [], but also [] or []. However, in , it represented a
voiced velar plosive /ɡ?/ or a voiced palatal plosive //. As a result, it was classified as a moon letter and it never assimilates the article.
In the written language, the ?? al- is retained regardless of how it is pronounced. When full diacritics are used, assimilation may be expressed by putting a
on the consonant after the lām, and non-assimilation by placing a
over the lām.
Sun letters
Moon letters
'the moon'
ath-thiqah
'the confidence'
????????????
al-murjān
'the coral'
Abboud, Peter F. et al. (1983). Elementary Modern Standard Arabic 1. Cambridge UP. pp. 123–124.  .
: Hidden categories:The Orbit of the Moon around the Sun is Convex!
The Orbit of the Moon around the Sun is Convex!
What does the orbit of the Moon around the Sun look like? Most people, even
almost all mathematicians I've asked this question, tend to believe that it
will have loops and look something like the picture below.
In fact it looks like this picture!
It is not a circle, but is close to a 12-gon with rounded corners. It
is locally convex in the sense that it has no loops and the curvature never
changes sign. (To be precise, it is more like a 13-gon, since we have to consider
the sidereal month of 27.32 days instead of the synodic month of 29.54 days,
and 365.25/27.32 = 13.37.)
There are several ways to see this. Since the eccentricities are small,
we can assume that the orbits of the Earth around the Sun and the
Moon around the Earth are both circles. The radius of the Earth's
orbit is about 400 times the radius of the Moon's orbit.
The Moon makes about 13 revolutions in the course of a year. The speed
of the Earth around the Sun is about 30 times the speed of the Moon
around the Earth. That means that the
speed of the Moon around
the Sun will vary between about 103% and 97% of the speed of the
Earth around the Sun. In particular, the speed of the Moon around
the Sun will never be negative, so the Moon will never loop backwards.
I like to visualize this as follows. Imagine you're driving on a circular race
track. You overtake a car on the right, and immediately slow down and go into
the left lane. When the other car passes you, you speed up and overtake on the
right again. You will then be making circles around the other car, but when
seen from above, both of you are driving forward all the time and your path
will be convex.
Another approach is to compute the gravitational forces involved.
It can be shown that the Sun's pull on the Moon is about twice the Earth's pull on the Moon. It follows that the Moon's orbit is primarily determined by the gravitation pull from the Sun, so the orbit of the Earth will always curve towards the Sun.
Here is a sketch of the details.
(G MassSun MassMoon/Distance(Sun-Moon)^2)/(G MassEarth MassMoon/Distance(Earth-Moon)^2) =
(MassSun/MassEarth) (Distance(Earth-Moon)/Distance(Sun-Moon))^2.
But Distance(Sun-Moon) is close to Distance(Sun-Earth), and Distance(Earth-Moon)/Distance(Sun-Earth) is 1/390 while
MassSun/MassEarth = 3.34X10^5, so we get 2.20.
You may also want to remember that it is the barycenter of the Earth-Moon system that moves
in an ellipse around the Sun, and that the orbits of both the Earth and the
Moon are perturbations of this ellipse.
by Erich Neuwirth is very nice,
but you must first get the
“The Sun, the Moon, and Convexity” by Noah Samuel Brannen in The College Mathematics Journal v. 32, 268-272 (2001) is excellent,
but also look at “Why the Moon's Orbit is Convex” by Laurent Hodges in The College Mathematics Journal v. 33, 169-170 (2002).
“Mad about Physics” by Jargodzki and Potter also discusses this problem.
The National Maritime Museum mentions this on their fact file about
but has a bad picture on their fact file about
If we assume that the ellipses are circles, the radius of the Moon's orbit is 1, the radius of the Earth's orbit is d,
and that the Moon makes p revolutions while the Earth makes one, then we get curves of the form (d cos(t) + cos(p t), d sin(t) + sin(p t)).
Above I used d=400 and p=13, but if we had changed the parameters, we could have gotten pictures like these.
It turns out that we loops when d & p, a wiggly path when p & d & p^2 and a convex path if p^2 & d.
For details, see the article by Brannen.
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