请教高手几到语法题

以下是引用sun-nan在2004-2-24 17:16:00的发言：
1.photographer Edward Steichen constantly (experimented new) techniques and materials (in) his quest (to have) photography accepted ( as) a creative art.



答案是：A                 为什么呀？


should be experimented with, experiment is a vi.



2.education in the united states is overseen by (local) school districts, (which) follow (regulations) mandated by their respective state (government).


答案是：D                         为什么呀？


by their respective state governments, plural form ought to be used here


3.(as) the (centrally) control organ of the body, the brain governs the (functioning) of the body's (other) organs.


答案是：B                         为什么呀？     我认为是“C”


function is the noun form, there is no word like functioning


4.The (migration route) of the first humans to occupy north America took (them across) a land bridge that once (was connected) ASia with (what) is now Alaska.


答案是：C                     为什么呀？


that refers to the bridge playing as the subject of the relative sentence, The bridge connected Asian with ..., rather than being connected.


5.（identical) twins are always (of the) same sex, (resemblance) one another very (closely), and have similar fingerprints and blood groups.


答案是：C                 为什么呀？我认为是"B"


resembling one another...., Look at the sentence again and try to find out which is the main sentence and the clause


6.loons, (migratory) aquatic birds, are expert (swimming) and divers, but (walk) on land with (difficulty).


答案是：B                        为什么呀？


expert swimmers and divers . the principle of balance in grammar

7. The concept of folk music, though generallyfficeffice" />

             understood by most people, has not simple,

             widely accepted definition

    

答案是：D         为什么呀？

has no simple ...definition

    

8. Working by chemical reaction, and being

             independence of atmospheric oxygen, rockets are

             used to power interplanetary space vehicles.

    

答案是：B             为什么呀？怎么改呀？

    

being independent of...

    

请高手执教，谢谢！

以下是引用shuhua在2004-2-25 0:42:00的发言：
3. (as) the (centrally) control organ of the body, the brain governs the (functioning) of the body's (other) organs



Control: is a noun    because of    the connection of     another noun(organ).


So, B centrally---central; functioning is correct.