锁：确保安全=油布：保护(事物及其作用)
13.GROUNDLESS:SUBSTANTIATION::
A incredible: plausibility
B germane: cogency
C artless: ingenuousness
D grave: sobriety
E forthright: truthfulness
参考答案：A
无根据的：证明=难以置信的/不可信的：似乎合理性(缺乏关系)
14.THRONG:DENSENESS::
A caricature: exaggeration
B travesty: acclaim
C morsel: bulk
D emulsion: purity
E morass: unity
参考答案：A
人群：密集=讽刺画：夸张(事物及其特点)
15.GRUFFNESS:CONVIVIAL::
A compliancy: unwary
B truculence: vicious
C flippancy: earnest
D erudition: urbane
E despondency: hopeless
参考答案：C
粗鲁：友善=轻浮：认真(反义关系)
词汇释义：
convivial:
《Webster》relating to, occupied with, or fond of feasting, drinking, and good company英语作文
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