请教GWD21-Q5

Q5:

There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.

1. There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.
2. There are no legal limits on the size of monkfish that can be caught, unlike cod or haddock, a circumstance that contributes to depleting them because they are being overfished.
3. There are legal limits on the size of cod and haddock that can be caught, but not for monkfish, which contributes to its depletion through overfishing.
4. Unlike cod and haddock, there are no legal size limits on catching monkfish, which contributes to its depletion by being overfished.
5. Unlike catching cod and haddock, there are no legal size limits on catching monkfish, contributing to their depletion because they are overfished.

答案是C，我认为A相对要好一些，毕竟C里which指代不清

还有Q1

Q1:

According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive Internet data over regular telephone lines with speeds much higher than is currently possible.

1. with speeds much higher than is
2. with speeds that are much higher than are
3. at much higher speeds as are
4. at much higher speeds than that
5. at speeds much higher than are

答案3E，但这里的are怎么讲呢？

请NN们给指点一下

相比之下只有E是最佳答案

are对应speeds,但为何要补be动词我也不明白

Q5:

There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.

1. There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.
2. There are no legal limits on the size of monkfish that can be caught, unlike cod or haddock, a circumstance that contributes to depleting them because they are being overfished.
3. There are legal limits on the size of cod and haddock that can be caught, but not for monkfish, which contributes to its depletion through overfishing.
4. Unlike cod and haddock, there are no legal size limits on catching monkfish, which contributes to its depletion by being overfished.
5. Unlike catching cod and haddock, there are no legal size limits on catching monkfish, contributing to their depletion because they are overfished.

   Answer: D                                A

Like / unlike A， B do 结构
                ，A，B前后一定要对称，排除 B，D，E，C选项的which 只能指代前面的一个先行词，不能指代整句话。而题目中的意思是由于没有对monkfish 捕捉大小的法律限制这件事情导致了它们的灭绝。而A 中的
                a circumstance t  很好的表明前面那句话的内容。有人对A 选项中的their 表示怀疑，但是Fish 这个词本身就有复数的含义，如下。

the word 'fish' and the specific kinds of fish such as 'trout', 'monkfish' etc. are always plural

For example

Fish are being eradicated by coastline toxic waste dumps.
            

Fishes, as a noun, is often mistakenly considered the plural of fish. Not the case. It's indeed plural, but means "species of fish".