我觉得可能可以通过It has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center.这句话来认为题中的nucleus事实上就是在spiral galaxy的中心？题目其实就是在讲galaxy的外围和中心的比较？（而且第二段的篇幅大概都在讲这个，做题时没理解就蒙是在讲这段的结论了....
Choice E: 代词the ones指代有误。这个代词通常用于指代前面出现过的一堆人或物种的几个，例如：
I planted a lot of roses in my garden. The ones in white I like the best.
例句中的the ones指代的是a lot of roses中的几朵。在本题中，显然同一群人不可能即被鲨鱼咬死又被蜜蜂咬死。
摘自CD 这题中包含了WITH独立主格结构。 正确句子：With corn, soybean, and wheat reserves（独立主格，with结构的主语） so low（形容词，修饰红色的独立主格） that a poor harvest would send prices skyrocketing（类似副词，修饰红+蓝部分，表示它们导致的结果）, grain futures brokers and their clients are especially interested in weather that could affect crops. 以上with结构可简化为：With+名词+修饰词，。。。该with结构在句首，修饰后面的主句主语或整个主句，表示与主句伴随发生的情况。
c,
* "Amount" is incorrect. Because rhinos can be counted, it needs to be "number" instead.
* "Population" already represents the number of rhinos. So, if "population" is there, the use of "number" or "amount" is redundant.
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我觉得可能可以通过It has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center.这句话来认为题中的nucleus事实上就是在spiral galaxy的中心？题目其实就是在讲galaxy的外围和中心的比较？（而且第二段的篇幅大概都在讲这个，做题时没理解就蒙是在讲这段的结论了....