请教大全上两道题~

  1.  Crises in international diplomacy do not
always result from malice; for nations, like individuals, can find
themselves locked into difficult positions, unable to back down.

(A)
do not always result from malice; for nations, like individuals, can find

(B)
do not always results from malice; nations, just as individuals, finding

(C)
do not always results from malice; nations, such as individuals, can find

(D)
aren’t always the results of malice; nations in the same way that individuals
can find（A）

(E) aren’t
resulting always from malice; just like individuals who can find

答案是A 我觉得是C啊。。。

A中分号后不是完整的句子，for nations,...can find...连个主语都没有。like的用法也不对吧。我觉得C更正确

2.
            Since
conscious patients often died of shock on the operating table, the invention of anesthesia was essential to the development of surgery
as the invention of the propeller was to powered flight.
        

(A) the invention
of anesthesia was essential to the development of surgery as the invention of
the propeller was to powered flight

(B) inventing
anesthesia was as essential for the development of surgery as the invention of
the propeller was for powered flight

(C) the invention
of anesthesia was as essential in the development of surgery much as the
invention of the propeller had been for powered flight

(D)
the invention of anesthesia was as essential to the development of surgery as
the invention of the propeller was to powered flight（D）

(E) the invention
of anesthesia was essential to the development of surgery, so was the invention
of the propeller essential to powered flight

疑惑在于A，A 中was essential to 中essential 是adj, 在后面的平行结构中省略，难道是错的吗？相对于D中was as essential to 要更好吧。。平行或对比结构的可省略部分究竟有哪些呢？ 望答之~~

THX！

1.such as 是举例 这个怎么去举例呢 分号后是完整的句子 这里for=because

2.as essential as 比较要并列 the invention of anesthesia was as essential (to the development of surgery )as the invention of the propeller was (to powered flight（D）)