HELP: 0505,0508 GRAMMAR

以下是引用dogtiie在2007-10-16 2:34:00的发言：
0505 
10: Type metal used in the printing industry varies in its components____is generally a combination of lead, tin and antimony.
A  as
B   if
C  why
D but

Correct answer is but. Why?  How about A?   根据意思来判断逻辑关系，见红色部分：句子意思是．．．会因．．．而变化，但是一般来说．．．怎么怎么样．

0508
9. United States income taxes are paid to the Internal Revenue Services, _____funds for use by the government.
A which distributes
B and distributes
C the distribution of
D so that the distribution of

Correct answer is A, how about C?　如果选Ｃ，你大概是想要个名词同位．但是和什么同位呢？没有合适的．

THANKS!!!

以下是引用dogtiie在2007-10-16 2:41:00的发言：
0508 
12.The garednia, about 200 species____ to tropical and
subtropical countries, was named in honor of eighteenth-century
naturalist Alexander Garden.
A  native of which are
B  are native of which
C which are native of
D of which are native

I choose C. answer is D.　                                                                                两点1,200 species of sth. :sth 中的２００种        2,词组　be native to

C 我看不出你选它的理由                                                           

30. Although Republican Dwight Eisenhower won the United States presidency in 1952 and 1956, the Democrats ran Congress for six of his eight years into office.
我会选Ｄ
37, Missouri is a heavily industrialized state whose
 leading products are transportation equipment, processed food, and chemical.
我选Ｄ

以下是引用dogtiie在2007-10-16 2:34:00的发言：
0505 
10: Type metal used in the printing industry varies in its components____is generally a combination of lead, tin and antimony.
A  as
B   if
C  why
D but

Correct answer is but. Why?  How about A?   根据意思来判断逻辑关系，见红色部分：句子意思是．．．会因．．．而变化，但是一般来说．．．怎么怎么样．

C 我看不出你选它的理由