Some scientists contend that many species of dinosaur had a metabolism more like a warm-blooded mammal’s than a cold-blooded reptile’s.

1. that many species of dinosaur had a metabolism more like
2. that the metabolism of many dinosaur species were more like
3. that the metabolisms of many species of dinosaurs were more like those of
4. there were many species of dinosaurs that had metabolisms more like those of
5. there were many dinosaur species that had a metabolism more like that of

这题不容易。但是知道答案是A后可以比较清楚地看出其他选项的问题。
B: 把metabolism放在of的前面导致了warm blooded mammal's 和cold blooded

reptile's与前面不对称。如果前面使用of构造，那后面也需要改成those/that of，

然后去掉's，就正确了。
CDE的问题比较明显，those/that of导致后面的's多余。
A：看似不太顺嘴，但是语法上正确。

请再讲讲为啥A就没有对称得问题,比较前用了动词性结构,比较后是名词性结构呀?还是晕

A:  a metabolism more like a warm-blooded mammal’s than a cold-blooded reptile’s.

B the metabolism were more like , 应该是was

这里的had a metabolism 的had和后面的's没有任何关系。需要对称的是

metabolism和后面的's。
例如：I have a car just like Johnny's。这里根本没有牵扯到动词词组和名词词

组的问题。