“unlike any other known insect” moves around
只有在选项C的位置，才没有歧义。
From Ron：the problem is just that it's not entirely clear what that sentence is supposed to mean. is it supposed to mean ...
... that no other known insect does the same thing at all? (this is the unambiguous meaning of the correct answer choice)
... or that other insects do the same thing, but not in the same way?
The positive integer k has exactly two positive prime factors, 3 and 7: k=(3^x)*(7^y)
If k has a total of 6 positive factors, including 1 and k: (x+1)(y+1)=6 #as x and/or y can be "zero"
A 意思不对。原本的意思是midge和其他insect不同，midge spend its entire life XXXX。而不是midge和insect在spend entire life上不同。
B any other的other不能少，只能和其他比较
C正确 这里的unlike后面的名字与that即a species of midge比较 OK
D because是连词，只能连接两个句子。 found XXX because it spends 这是两者之间并没有因果关系 错误
E spending作为伴随状语，逻辑主语为any other insect，但实际上应该是a species of midge
ing短语表达的是一种“过程”，没有明确的时间终点
名词短语具有明确的时间终点
(1) Exploring the cave is taking a long time. 正确，终止时间未知
(2) The exploration of the cave took three days. 正确，终止时间已知
(3) **Discovering fossil bones repeats again and again. 错误，未结束的事件不可重复
(4) The discovery of fossil bones repeats again and again. 正确
在一个句子中，代词it如果反复出现，其必须指代同一个单数名词（they也是同样的道理）
by the animal overcompensating中的by是介词，身后只能添加名词短语（注意区分这种情况和独立主格的情况）。因此，overcompensating必须为动名词短语（未划线部分的growing也是同理）。
如果想给动名词短语添加逻辑主语，只能用所有格的形式，即：animal‘s overcompensating
if allowed to remove and replace the discolored layer of varnish on the Mona Lisa是伴随状语，其就近修饰the colors Leonardo da Vinci painted nearly five hundred years ago will once again shine through。因此，allow的字面主语为其所修饰的句子的主语colors。在逻辑上，被允许替换蒙娜丽莎这幅画像的光泽层的一定是某些人，而不可能是colors。
代词it是形式主语，还原为正常语序则有：
to remove and replace the discolored layer of varnish on the Mona Lisa is allowed.
这句话并没有说明remove和replace的逻辑主语是谁。在本句的逻辑上，这句话是restorers说的，自然应该是这些人去移除褪色的颜料，不能不指明remove和replace的逻辑主语。
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led是“引领”的意思，显然对于conclude事件的约束力较强，需用不定式短语做宾补。