OG 234

og234The 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

og解释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.

我的问题：为什么d中的it是inprecise的，按照逻辑指代原则，it指代the wavelength of infrared

radiation，那么黄色部份是正确的，当然绿色的在这种情况下错误；反过来，按照ets解释，绿色

不正确原因成立，那么黄色部份的it指代就是清晰的，指代the wavelength。也就是说，按照我对

ets自己的解释的理解，不应该同时出现代词指代和句子谓语修饰的错误，好比“矛和盾”。反

之，est两者都解释正确，那我的理解错误。

不知道我说清楚了没，自己也觉得很搞不清楚，见谅。附上自己的理解，请指教。

我的解释：代词指代不清，指代分句主语还是分句主语的修饰部份，错，当所有各为主语时，其

后的代词指代可能产生指代不清得问题；谓语动词修饰错误，原句意思infrared radiation is

invisible，这里变成the wavelength of infrared radiation is thus invisible,

请求指点，谢谢大家。

附：1、本题中it不应该前句主语，依据见og232