[求助]新prep1-195，关于对等，请NN指教

Like the grassy fields and old pastures that the upland sandpiper needs for feeding and nesting when it returns in May after wintering in the Argentine Pampas, the sandpipers vanishing in the northeastern United States is a result of residential and industrial development and of changes in farming practices.

A. the sandpipers vanishing in the northeastern United States is a result of residential and industrial development and of changes in

B. the bird itself is vanishing in the northeastern United States as a result of residential and industrial development and of changes in

C. that the birds themselves are vanishing in the northeastern United States is due to residential and industrial development and changes to

D. in the northeastern United States, sandpipers’ vanishing is due to residential and industrial development and to changes in

E. in the northeastern United States, the sandpipers’ vanishing, a result of residential and industrial development and changing

正确的选项是B，我选择的是A,其实我觉得A和B似乎都不对等，主句的主语应该是和grassy field 及old pastures对称才对啊，怎么是bird和它们对称呢，逻辑上似乎不对呀....

请NN指教

我也选了A.

做个标记,回头看NR回复

欧 我的god，光想着对称去鸟....谢谢斑竹达人和tony171717

B的itself就可以推出是类比了 否则itself就罗嗦了

A即使主谓一致也仍旧是逻辑错误

以下是引用wangluxb在2009/9/2 10:56:00的发言：
关于逻辑主语对等的问题，大家看这个讨论，很有用。btw，这道题实在是一道挑战神经极限的题。
" target="_blank">http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=55197

哈哈~我做这题的时候也错了，开始怎么也想不通怎么对等的