GWD-9-1和GWD-9-27

GWD-9-Q1

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.

A.   
Black
Americans—the others being Richard Wright, author of Native
Son,
and Ralph Ellison, author of Invisible Man

B.   
Black
Americans—including Native Son by Richard Wright and Invisible
Man
by Ralph Ellison

C.   
a
Black American—including Richard Wright, author of Native
Son,
and Ralph Ellison, author of Invisible Man

D.   
a
Black American—the others being Richard Wright, author of Native
Son,
and Ralph Ellison, author of Invisible Man

E.    
a
Black American—the others being Richard Wright’s Native
Son
and Ralph Ellison’s Invisible Man

请问为什么选E而不选A呢？ 这道题的语法点是什么呢？

GWD-9-Q27:

Scientists have identified an asteroid, 2000 BF19, that
is about half a mile wide and, if it strikes Earth, it can do tremendous
damage to part of the planet but probably not cause planetwide destruction.

A.   
and,
if it strikes Earth, it can do tremendous damage to part of the planet but

B.   
and,
if it would strike Earth, part of the planet could experience a tremendous
amount of damage but it would

C.   
and
that, if it were to strike Earth, could do tremendous damage to part of the
planet but would

D.   
and
that, if Earth is struck by it, can do part of the planet tremendous damage,
but it would

E.    
and
that, if it strikes Earth, it could experience a tremendous amount of damage
but

 为什么选C不选A呢？

one... the others

指代对象要对等，A中one指代书，the others指代人，不对等

后一题：

两个定语从句并列，that... and that...