2道语法题

aleafasboat

in the united states (among)  60 percent (of the space ) on the pages of newspapers (is reserved) for (advertising).A为什么不能倒装，D 为什么不用名词advertisment

The early (periods of aviaton) in the unite states was marked by (exhibition flights) made by (individual fliers) or by (teams of performers) at country fairs.为什么C的名词为复数但是前面却是修饰名词单数的形容词。

小弟出来报道，大哥大姐帮忙解释一下，

chasedreamoox

我来说说，也不清楚对不对

60 percent of the space  on the pages of newspapers是一个完整的部分做主语，如果是＋among倒装，就缺主语

katherine8110

我也说说，(is reserved) for ，应该是被动语态吧，反正意思说不过去

第２个应该是period ,individual 如果看作形容词的话就好理解了，就好象colorful,wonderful 一样

gtren

among ===>>>> about

this is not an inversion structure. Please compare:

Among the most beautiful cities in Canada is Montreal.
                                                                       (subject)

numberX

麻烦你标明一下出处好吗？