13. Defense Department analysts worry that the ability of the United States to wage a prolonged war would be
seriously endangered if the machine-tool manufacturing base shrinks further. Before the Defense Department
publicly connected this security issue with the import quota issue, however, the machine-tool industry raised the
national security issue in its petition for import quotas.
Which of the following, if true, contributes most to an explanation of the machine-tool industry’s raising the issue
above regarding national security?
A. When the aircraft industries retooled, they provided a large amount of work for too builders.
B. The Defense Department is only marginally concerned with the effects of foreign competition on the
machine-tool industry.
C. The machine-tool industry encountered difficulty in obtaining governmental protection against imports on
grounds other than defense.
D. A few weapons important for defense consist of parts that do not require extensive machining.
E. Several federal government programs have been designed which will enable domestic machine-tool
manufacturing firms to compete successfully with foreign toolmakers.

这题有点搞不清楚,解释也看得迷糊

13.
Since the size of the machine-tool manufacturing base presumably has implications in area beyond national
security, one might find it surprising that the industry raised the security issue in its petition. C, the best answer,
explains that the industry turned to this issue because others tended to be ineffective in efforts to obtain
governmental protection. A explains why the industry might NOT raise the security issue, since it suggests that it
might have raised the issue of jobs instead. B explains why the industry might NOT raise the security issue
about import quotas, since it suggests that the Defense Department had no interest in import quotas whatsoever.
Neither of D and E is relevant to the industry’s choice of strategy for securing import quotas.

谢谢答复啊!!

题目让你解释为何在the Defense Department把security issue跟the machine-tool industry的import quota公开联系起来以前，the machine-tool industry就已经以security issue为名申请import quota了。

而最佳答案C的解释是因为the machine-tool industry利用其他原因申请import quota遇到了困难。

不知明白了否？