烦请高人指点限定性定从和非限定性定从.

prettywoman

本来以为非线前面跟',',代表修饰词的所有部分都是这样,而不带逗号的是限定性定从表示修饰词只有部分是这样,请参看OG234 和237如下,可是又看到OG141, 答案C "Unless the transplant involves indentical twins who have the same genetic endowment',照例这里who从句式限定性的,只表部分,翻到应该错.真实被ETS弄晕了,还有两个星期就考试了,这可怎么办?!请高人指点一二,谢过先!

OG 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 top 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
选A
对于E选项，OG特别提到，由that引导的限定性定语从句含有“not all wavelengths of 0.1 millimeters are too long for the eye to register”之意。逻辑不当，应该换成由 which 引导的非限定性定从。

OG 237
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
(A) may be caused by the interaction where two stars orbit each other
(B) may be caused by the interaction between two stars that each orbit the other
(C) are because of the interaction between two stars that orbit each other
(D) are caused by the interaction of two stars where each is orbiting the other
(E) are caused by the interaction of two stars orbiting each other
选E
对于C选项，OG 也说，“the phrase two stars that orbit each other illogically suggests that there are two particular stars causing all the phenomena in question, rather than various sets of stars in various locations.”

想旅游的笨蛋

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

LES版主以前写信給ETS詢問过了，ETS的回覆:

非限定就是要在who前面加逗號，這是OG少見的印刷錯

prettywoman

CD is just Great!!! Good luck to all CDers!