as much/many as...万能的CD啊，我被搞晕了

哪位能点拔我一下下面两句话错在哪里？谢谢！！！

This newspaper cost 50 cents as much as that one.
As many as or more than 250 newspapers are published here.

另外Prep2008破解语法p80
There is one PC for every 32 pupils in American four time as many as there WERE four years ago.

谓语为神马是were而不是was？比较的不是one PC for every X pupils吗？

This newspaper cost 50 cents as much as that one.  

Carbon-14 dating reveals that the megalithic monuments in Brittany are nearly 2,000 years as old as any of their supposed Mediterranean predecessors.

第一个：
This newspaper cost 50 cents as much as that one.  
-->  50 cents as much as that one是无意义的.
如果as much as修饰的是50 cents，那么much就是做adj.，而同时as much as向后修饰时，应该做adv.来修饰省略的cost.
所以much就有了双重身份.
能肯定的两点是50 cents as much as这样的结构一定是错的，as much as后面加破折号一定是对的.
但是我不能肯定在50 cents之后加上逗号是不是就对了，虽然说这样as much as更可以跳过50 cents修饰cost，但是as much as作为一个appositive modifier依然有修饰50 cents的能力. （怎么说至少比原来的好，我的经验是不能肯定排除某样东东的时候，那么就先认为它是对的。）

OG有个类似的题，但没说语法上的错误，只说了逻辑上应该是oler than.
OG10-5, OG11purple-33. Carbon-14 dating reveals that the megalithic monuments in Brittany are nearly 2,000 years as old as any of their supposed Mediterranean predecessors
(A)  as old as any of their supposed
(B)  older than any of their supposed
(C)  as old as their supposed
(D)  older than any of their supposedly
(E)  as old as their supposedly

Exp. from OG10: Choices A, C, and E do not state the comparison logically. The expression as old as indicates equality of age, but the sentence indicates that the Brittany monuments predate the Mediterranean monuments by 2,000 years.
In B, the best choice, older than makes this point of comparison clear.
B also correctly uses the adjective supposed, rather than the adverb supposedly used in D and E, to modify the noun phrase Mediterranean predecessors.

Exp. from OG11:
Logical predication + Diction
The original sentence has two problems．(1) Comparisons must be logical and easy to follow. The Brittany monuments are logically older than the Mediterranean ones．Therefore，the appropriate comparison uses the phrase older than，not as old as． (2)Adjectives，not adverbs，modify nouns．The phrase Mediterranean predecessors requires the adjective supposed．
A  Suggests two sets of megaliths are equally old，not that one is older
B  Correct．This sentence makes the proper comparison and uses the adjective supposed．
C  Suggests two sets of megaliths are equally old，not that one is older
D  Makes correct comparison；adverb supposedly used instead of adjective supposed
E  Suggests two sets of megaliths are equally old，not that one is older
The correct answer is B．
第二个：
As many as or more than 250 newspapers are published here.
--> At least 250 newspapers are published here.
--> More than 250 newspapers are published here.
--> 250 newspapers are published here.

1.This newspaper cost 50 cents as much as that one.   costs吧

3.谓语为神马是were而不是was？比较的不是one PC for every X pupils吗？---因为there be 是要求 就近原则的 。