请NN们帮忙看两道题 increased和increasing的区别

托福要考一百一

For some birds the sense of smell appears to play a role in navigation,
since pigeons with surgically removed olfactory' nerves were found to
have increased difficulties in homing.
A.were found to have increased difficulties
B.have been found to have increased difficulty
C.were found to have increasing difficulty
D.have been found to have increased difficulties
E.have been found to have increasing difficulties
正确答案是B
请问：1.越来越多的困难应该用复数difficulties吧?
     2.increase修饰difficulty,那么困难是自己变多的而不是被变多的，我觉得
       应该用increasing而不是increased
因此我选了E

Contrary to earlier conjectures, it may be that increased atmospheric carbon
dioxide as a result of burning fossil fuels would cool the globe by reducing
the amount of solar energy absorbed by snow.
A.increased atmospheric carbon dioxide as a result of burning
B.increased atmospheric carbon dioxide resulting from the combustion of
C.increasing carbon dioxide in the atmosphere resulting from the combustion of
D.carbon dioxide in the atmosphere that increased from burning
E.atmospheric carbon dioxide that increased from burning
这道题还是那个increased和increasing的问题
难道increased sth. 是固定用法？

yangshuyun

你发的第二个题的答案是什么？？

西瓜2011

楼主针对你提出的两点我认为1单复数：前面说的那一堆是增加了建鸟巢的困难数目还是建鸟巢的困难程度呢？
                 建鸟巢也不能有多种困难呢。简单一句话就是不好搭巢了呗。
                 况且前面说的是“一件事”增加了困难。所以私以为用单数可以。也许解释太牵强。不过用单数总是能在题里找到一定依据的。
2困难是自己增加，还是被增加？这都行
 不过不是一件事增加了困难吗？所以困难被增加了啊。

awsxcft

ed表示被动和完成ing表示主动和持续的动作。resulting from表明了后面是被动。我是这么认为的。当然单纯的在increased和increasing之间一般选前者的多。

托福要考一百一

哦，谢谢哈，原来是条规律啊

lvbin19900809

xdf书上写的是increased sth 和increasing sth选择时，都选increased