如上面的例子:Unlike transplants between identical twins, whose genetic endowment is the same: 与双胞胎之间的器官移植不同, (他们具有相同的基因特征), ......
141.
Unlike transplants between identical twins, whose genetic endowment is the same, all patients receiving hearts or other organs must take antirejection drugs for the rest of their lives.
a.Unlike transplants between identical twins, whose genetic endowment is the same
b.Besides transplants involving identical twins with the same genetic endowment
c.Unless the transplant involves identical twins，who have the same genetic endowment
d.Aside from a transplant between identical twins with the same genetic endowment
e.Other than transplants between identical twins, whose genetic endowment is the same
ABDE介词平行问题: Besides, apart from , other than A, B......., A 和B 必须逻辑平行
_Choice C, the best answer, solves these problems by using a clause introduced by Unless to describe the exception to the rule and a nonrestrictive clause beginning with “，who” to describe the characteristic attributed to all identical twins.
最开始的时候ETS少打印了一个“，”，没有逗号就是限定性！
_In B and D the expression identical twins with the same genetic endowment wrongly suggests that only some identical twin pairs are genetically identical.
234. The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.
(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible
Choice A, the best answer, is clear, idiomatic, and grammatically correct. In B, the misplaced participial phrase making it invisible modifies eye rather than wavelength, thus producing a confusing statement that distorts the meaning. In C, D, and E the use of the second it is so imprecise as to be confusing. Furthermore, in D, and thus invisible incorrectly modifies wavelength rather than infrared radiation. Choice E produces an illogical statement by using a restrictive clause introduced by that where a comma followed by the nonrestrictive “which” is （就是“，which”）required: a wavelength of 0.1 millimeters that is too long nonsensically suggests that not all wavelengths of 0.1 millimeters are too long for the eye to register.
Thank you for your inquiry regarding two Sentence Correction questions and their explanations in The Official Guide for GMAT Review.
My colleagues and I have examined the questions and their explanations in light of your inquiry, and we have determined that your confusion is entirely justified: there is a printing error in question 141, option C. Nonrestrictive clauses should indeed be set off by parenthetical commas, and there should therefore be a comma after "twins" in option C. We appreciate your calling this error to our attention, and we will revise the question for future editions of the Guide.
Thank you very much for taking the time to share your concern with us. We are always grateful to receive inquiries such as yours because they help us to improve the quality of our tests and test preparation materials.
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发表于 2009-2-2 01:07:00
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