[讨论]大全中的有关just as ... so ....的用法解释

作大全时发现从464 —468题都是有关 just as .... so..... 的考点，要求just 后必须接句子，so 后也同样如此。我的问题是这样怎么感觉像两个关联词连接了两个从句，没有主句， 不就变成了run—on sentences 了么？请大家指正，谢谢！！以下是例句。

1.        Just as a writer trying to understand shtetl life might read Shalom Aleichem or Isaac Bashevis Singer, in the same way writers trying to understand Black life in the American South might well listen to records by the Mississippi Delta bluesman Charlie Patton.

(A) in the same way writers trying to understand Black life in the American South might well listen to records

(B) in the same way writers who try and understand Black life in the American South might well listen to record

(C) so a writer trying to understand black life in the American South might well listen to records

(D) so do writers try and understand Black life in the American South and might well listen to a record（C）

(E) then writers trying to understand Black life in the American South could well listen to records

2.        Just as plant species native to regions with browsing mammals evolved many natural anti-browser defenses (such as sharp spines and toxic chemicals), so humans in malarial regions have evolved dozens of chemical defenses against malaria.

(A) so humans in malarial regions have evolved dozens of chemical defenses against malaria

(B) humans in malarial regions have been evolving dozens of chemical defenses against malaria

(C) there has been, in malarial regions, an evolution of dozens of human chemical defenses against malaria

(D) dozens of chemical defenses against malaria have been evolved by humans in malarial regions（A）

(E) similarly, in malarial regions, humans have evolved dozens of chemical defenses against malaria

3.        Just as reading Samuel Pepys’s diary gives a student a sense of the seventeenth century—of its texture and psyche—so Jane Freed’s guileless child narrator takes the operagoer inside turn-of-the-century Vienna.

(A) so Jane Freed’s guileless child narrator takes the operagoer

(B) so listening to Jane Freed’s guileless child narrator takes the operagoer

(C) so the guileless child narrator of Jane Freed takes the operagoer

(D) listening to Jane Freed’s guileless child narrator takes the operagoer（B）

(E) Jane Freed’s guileless child narrator takes the operagoer to her opera

4.        Just as the European countries of the early eighteenth century sought to exploit the resources of our continent, so too are we now attempting to extract energy and minerals from the ocean bed.

(A) Just as the European countries of the early eighteenth century sought to exploit the resources of our continent, so too

(B) The European countries of the early eighteenth century sought to exploit the resources of our continent, and in a similar way

(C) Like the case of the European countries of the early eighteenth century who sought to exploit the resources of our continent, so too

(D) As in the exploitation of the resources of our continent by European countries of the early eighteenth century（A）

(E) Similar to the European countries which sought in the early eighteenth century to exploit the resources of our continent

5.        Just because King Alfred occupied and fortified London in 886 did not mean that he also won the loyalty of its citizens: the invading Danes were well aware of this weakness and used it to their advantage in 893.

(A) Just because King Alfred occupied and fortified London in 886 did not mean that he

(B) The fact that King Alfred had occupied and fortified London in 886 did not mean that he had

(C) Just because King Alfred occupied and fortified London in 886, it did not mean he

(D) The fact that King Alfred occupied and fortified London in 886, it did not mean that he（B）

(E) Just because King Alfred had occupied and fortified London in 886, it did not mean he