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4. The first term of the sequence above is 2,and every term after the first term is －2 times the preceding term. How many of the first 50 terms of this sequence are less than 100?

什么东西可以做主语呢？这里使用的是两个稍微复杂的主语，大家可以学习一下。

这个电影给我们的经典启示就是，一定要学会讲废话，要学会铺垫，把真正激动人心的东西先压抑着，在关键时刻再拿出来。

那么，好吧，就从大道理开讲。SAT考官不太欢迎古板的文章，所以请你一定要说得严谨，展示你缜密的思维。

对于这样的文章，结尾段要非常注意，因为一味证反，会让人觉得过于咄咄逼人，因此往往在最后一段进行平衡。“A loyal friend will probably tell you the truth when you need to hear it. But what is perhaps more important to many people is that a loyal friend also knows just how and when to lie.”文章结尾的两个句子，虽然表达的是同一个意思，但看起来却是再一次从正反两个方面有力地说明“聪明的朋友知道何时说真话，何时说假话”。

这个常数叫做等差序列的公差（common difference），

effectively develops a point of view on the issue and demonstrates strong critical thinking, generally using appropriate examples, reasons, and other evidence to support its position

Assignment: what do you think of the idea that a person's worth is based on how much he or she produces? Is this an accurate scale for measuring worth or should we use different criteria to make this judgement? Plan and write an essay in which you develop your point of view on this issue. Suppport your position with reasoning and examples taken from your reading, studies, experience, or observation.

其出现的理想位置是段落之首，并且它一般都由两个部分组成：topic＋controlling meaning

平均数（average, arithmetic mean）：若干个数的平均数，是用这些数的和除以数的个数。

接着，作者用哥伦比亚航天飞机失事和越南战争的例子作为自己的thesis statement （As the examples of the recent Columbia shuttle disaster and the Vietnam War demonstrates, events that are not successful still have value）。

第四段是作者的反思，就是历史上有很多英雄的例子，但是后人根据自己的想象不停地对那些英雄事迹进行改写，而死人是无法给自己辩解什么的，所以电影或自传书中的英雄形象多多少少会被人为的东西剥夺光辉，这也是我们为什么很难找到一个真正英雄的原因。

在开始段落，作者首先表明中心论点是这个世界上几乎没有永恒的英雄（there are figures who will always be in the history books, but they won't always be regarded as heroes）。

（D）<图>

由若干个集合的所有元素所组成的集合。

（D）21

关于“argumentation”与“report”

If twice as many $1 bulbs as $2 were ordered, how many light bulbs were ordered altogether?

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