第三节.词汇 （共20小题；Ⅰ每小题1分，Ⅱ每小题1分，满分20分）
I. 根据英文释义填写适当的单词，单词首字母已给出。
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51
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l________________
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adj.
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free, not tied up
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52
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c________________
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n.
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piece of material hung to cover a window
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53
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p________________
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n
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word for gas in British English
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54.
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g________________
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adv.
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not sudden; in a gradual way
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55.
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a________________
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adv.
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in fact
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