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求问一下考试可以带计算器吗？不能带的话排列组合的一些阶乘怎么快速计算啊？

Mayor: Since the time that our city's central streetcar line was built ten years ago, over $4 billion of private development has occurred within one-half kilometer of the line. This private development increased the city's tax revenue over those ten years just enough to compensate for the cost of building that line. So our city's proposed development of an eastside streetcar line through a similar neighborhood should also pay for itself within ten years.

Which of the following is an assumption the mayor's argument requires?

(A) Over the past ten years, private developers have invested in significant development within one-half kilometer of the proposed eastside streetcar route. (B) Littleifanyoftheprivatedevelopmentreferredtowouldhaveoccurredifthestreetcar line had not been built. (C) One benefit to the city from the central streetcar line has been the increased tax revenue from private development in other parts of the city. (D) Lessthan$4Billionofprivatedevelopmenthasoccurredmorethanone-halfkilometer from the central streetcar line over the past ten years. (E) The central streetcar line did not cost the city significantly more to build than the eastside streetcar line will cost. 

这题难道不是类比推理吗? 因为第一条line在10年内收回成本所以新的line也可以. 为什么答案不选E?

求解答,谢谢

小白og刷了两遍，sc刷了三遍了 第一次做随便点了模考题prep 15 错了很多很多直接给我做哭了。。。还有十天就考试了不知道该怎么办了

毕出21套语法1 The cottontail rabbit population in Orange County, California, has increased unchecked in recent years as a result of the removal of the native fox population and the clearing of surrounding woodlands. (A) years as a result of the removal of (B) years as a result of removing (C) years, resulting from the removing of (D) years, which is a result of removing (E) years, which is a result of the removal of 这题which引导定语从句，不可以修饰整个句子吗？？

因式分解部分 因式分解错误

为啥k（2017*2018k+1）是完全平方数，k就是完全平方数？

There's also a push to add clearer language

the general density dependence model那篇，prep里面也有的 为什么第二段的目的是proposing a possible explanation for an inconsistentency，而非defend the validity of a particular study's conclusions??? 但 ex7全文目的是explain why a model remains valid despite inconsistent research results 这不就是第二段说明的东西吗，诚如ex7 E选项解析所言。但是ex5 E选项解析又说，作者在第二段只是想给出解释，并不是要维护这些研究的结论 这不是矛盾吗

毕出老师好， he is prone to jump to conclusions。这个句子属于基本句型三，表语后边的to jump...属于什么成分？