11 OG 107 有关 it is ... for... to do sth.. it 的指代问题

107:

107．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 eve 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

Grammatical construction + Logical predication

This sentence requires attention to clear references and appropriate modification．Here its clearly refers to infrared radiation；it is the radiation that is invisible, and the wavelength that is，too long．

A  Correct．This sentence clearly and grammatically explains why infrared radiation is invisible．

B  Making it invisible modifies eye, rather than wavelength．

C  It is ambiguous and lacks a clear referent．

D  It is imprecise；thus；invisible modifies wavelength，rather than infrared radiation．

E  Using a restrictive clause introduced by that suggests that not all wavelengths of 0．1 millimeters are too long for the eye to register, it is ambiguous and 1acks a clear referent．

The correct answer is A．

OG分析C 选项 指代不明. 我有些不明白.

it is ... for... to do sth..  句型, it 作为形式主语, 不都是指代" to do sth" 么? 请大家帮解释下怎么ambiguous 了?

谢谢!

infrared radiation is Invisible because its wavelength-0．1 millimeters-is too long for the eve to register it

最后的it指代歧义在于，有可能是指代wavelength或是infrared radiation