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
OG对D的解释说thus invisible 是修饰wavelength而不是修饰infrared radiation,为什么这么说呢？
it的指代跟its的指代是不是同一个指代阿，如果是那C里的its是指代radiation，那么it也指代这个radiation那it指代不就没问题了吗？
D选项：however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
and前后是并列结构，而and后面省略了主谓。
补全的话是：
because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus（ it is ）invisible
因为前面的it是指代infrared radiation，后面的it应该与前面的it所指一致。
所以thus invisible 是修饰wavelength的而不是修饰infrared radiation的。
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C句中：
infrared radiation, however, is invisible because its wavelength--0.1 millimeters--is too long for the eye to register it
当不定式修饰其逻辑宾语时：
Can you give me some work to do? 不定式的后面是不能带宾语的
正如本句中：
"its wavelength is too long to register" to register是修饰其逻辑宾语"its wavelength"的，所以，不定式to register后面不能再跟it了。
查了下菜鸟手册，里面的说法是：
In C the use of the second it is so imprecise as to be confusing
并不是说指代不清，而是it放在这里让很疑惑，咋不删呢?
出去玩了两天...momo...回来发现RC的社科类文章看了就头疼
多谢aeoluseros啊
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
对D的解释完全同意~~
E中说it多余也说得过去，但是总觉得OG这样说it指代不清，也肯定有其道理，只是不知道OG是怎么想的。
不管怎么样，先记住：
当不定式修饰其逻辑宾语时，如Can you give me some work to do? 不定式的后面是不能带宾语的。
我想OG说的可能就是这条语法规则的根本原理，哪天我查到了马上发上来。
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