[求助]两题PREP语法 请各位大虾帮忙指点～

139.
            (32103-!-item-!-188;#058&006640)

Taste buds are onion-shaped structures with between 50 and 100 taste cells, each of them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore.    

(A) them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore

(B) them that have fingerlike projections that poke through an opening located at the top of the taste bud, which they call the taste pore

(C) which has fingerlike projections poking through the opening, called the taste pore, located at the top of the taste bud

(D) which having fingerlike projections that poke through an opening, which is called the taste pore, located at the top of the taste bud

(E) which have fingerlike projections that are poking through an opening located at the top of the taste bud called the taste pore

我知道其他为什么错，但是

为什么C项中called和located同时修饰opening却不用and来连接？

这样难道不会形成located是用于修饰taste pore的混淆？

146.       (32521-!-item-!-188;#058&007141)

The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's.  

(A) extinction; its numbers are now five times greater than

(B) extinction; its numbers are now five times more than

(C) extinction, their numbers now fivefold what they were

(D) extinction, now with fivefold the numbers they had

(E) extinction, now with numbers five times greater than

为什么这里greater than后面不用跟that指代前面的number呢？

1. located修饰的是pore.洞在味蕾尖

2. 后面要不要加THAT或者谓语主要是看有没有歧义。主系表THAN后不需要加谓语和代词,因为为表语和THAN后面的通常并列修饰主语。