请教大家几道语法题

请教大家几道题目,多谢啦!

1. 题见新东方补充材料的P36第166
(As virtually all the nation's 50 busiest airports are), New York's were built for an age of propellers,before jet planes weighing 800,000 pounds needed over two miles of runway.
A.As virtually all the nation's 50 busiest airports are
C.like virtually all of the nation's 50 busiest airports
answer is C, but why A is wrong?

2. During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 down to its nadir in 1933.
B. During the Great Depression, industrial output fell by nearly fifty percent from its peak in 1929 to its nadir in 1933.
E. During the Great Depression, industrial output fell from its peak in 1929 to its nadir in 1933 by nearly fifty percent.

正确答案是B, 可是为什么E不对呢，by nearly fifty percent的位置为什么一定要在from 之前？

3. Although psychoanalyst Melaine Klern's theories of infantile aggression were derived in part from Freud's drive theory, she developed a view of human life that was "distinctly her own".
A)
B) distinct and her own
C) distinct as here
D) her own, distinctively
E) distinct to herself
The key is A. But why E is incorrect?
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