问GWD第12套中的语法题

A mixture of poems and short fiction, Jean Toomer’s Cane has been called one of the three best novels ever written by Black Americans—the others being Richard Wright, author of Native Son, and Ralph Ellison, author of Invisible Man.

1. Black Americans—the others being Richard Wright, author of Native Son, and Ralph Ellison, author of Invisible Man
2. Black Americans—including Native Son by Richard Wright and Invisible Man by Ralph Ellison
3. a Black American—including Richard Wright, author of Native Son, and Ralph Ellison, author of Invisible Man
4. a Black American—the others being Richard Wright, author of Native Son, and Ralph Ellison, author of Invisible Man
5. a Black American—the others being Richard Wright’s Native Son and Ralph Ellison’s Invisible Man

正确答案是B，可是including 这个词不是只能修饰相邻的名词或者之前的整句句子吗？怎么能够隔着修饰？我因此选了A

请教各位了。。。

E

mbamom能给点解释么~~?

另有一题答案更是想不通：

GWD13套 

Q6:

After more than four decades of research and development, a new type of jet engine is being tested that could eventually propel aircraft anywhere in the world within two hours or help boost cargoes into space at significantly lower costs than current methods permit.

A.       tested that could eventually propel aircraft anywhere in the world within two hours or help

B.       tested that could eventually have the capability of propelling aircraft anywhere in the world within two hours or to help

C.       tested, eventually able to propel aircraft anywhere in the world within two hours, or helping

D.       tested, and it eventually could propel aircraft anywhere in the world within two hours or helping

E.        tested, and it could eventually have the capability to propel aircraft anywhere in the world within two hours or help

答案是E但是E却是我首先就排除的could和capability语意重复啊，我选了C请大家指教一下。。。。

再有一题：GWD13 Q29

For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrowweed supported by posts set in a rectangle.

1. each a roof of poles and arrowweed
2. each a roof of poles and arrowweed that are being
3. with each being a roof of poles and arrowweed
4. with roofs of poles and arrowweed to be
5. with roofs of poles and arrowweed that are

答案A，谁能给点解题思路那？我不理解each a roof是什么，我觉得要么是with a roof of poles and arrowweed supported, 要么就光a roof of...each放在这里算什么那？晕死了，有没有NN给点思路啊！？