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(D)Before they were widely collected for their
(A)as a medical student
在那篇关于哥伦比亚失事的范文里，如果你对这个事情本身比较清楚，你完全可以把哥伦比亚失事这件事写成个narrative的形式，甚至花点笔墨来描写失事的过程都无伤大雅。
方程组（system of equations）：把若干个方程合在一起研究，使其中的未知量同时满足每一个方程的一组方程。
5．once in a blue moon极为罕见；难得有一次
这个俗语的真正意思很难从它的字面上去猜测。据观测，在一定条件下，当大气中含有一定数量的、大小合适的微尘时，月亮就会呈深蓝色。月亮呈深蓝色这种现象比较罕见，因为人们夜间在户外活动的时间大大少于白天，再加之微尘的扬起夜间少于白天。根据月亮出现的这一罕见现象，人们便用once in a blue moon表示“极为罕见，千载难逢”等义。
6. To address their financial woes, the vintners decided to hold two tastings per year instead of one and they would increase ticket prices by fifty percent.
Article 40 enter combat readiness level by the corps of orders or head of the detachment from the higher leadership for approval and announcement
正确答案：D
It was that year that my mind openedand I began to truly become educated. Rather than trying to fill my head with disconnected facts and other people's ideas, I now collect knowledge that I can use to form or change my opinions. And I plan to continue this my whole life, facing new situations with an educated, open mind.
主谓一致的一个难点在于，虽然英文中有些名词看上去是复数，但谓语动词要采用单数；而有些名词看上去是单数，谓语动词却要采用复数形式。有些名词在表达不同意思时，谓语动词要根据其意思采用单数或复数形式。这个问题，在英语语法中的相关规则很多，此处只列举SAT可能会考到的常识点：
例句-4: \"I really wanted to try out for the basketball team when I was in college. But the cards were stacked against me: I\'m only five feet six inches tall and everybody else was six-two or even taller.\"
人说：“当我上大学的时候，我真想参加篮球队。可是，那不，我身高一米六多，而人都有一米八。”
<图>，选E。
由于Don的分数是中位数，所以69≤Don的两轮得分≤73。
前n项和公式为<图>
In today's fast-paced, driven society, much emphasis is placed on the final result of an endeavour. American society places a premium on success; our culture has little tolerance for failures or losers. Within this culture framework it sometimes becomes easy to immediately dismiss failures. However, value is not found only in success. As the examples of the recent Columbia shuttle disaster and the Vietnam War demonsstrates, events that are not successful still have value.
第四节 分数和小数
一个考生的SAT作文将由两位阅卷者评判。
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