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。
    
        
            | 51 | l________________ | adj. | free, not tied up | 
        
            | 52 | c________________ | n. | piece of material hung to cover a window | 
        
            | 53 | p________________ | n | word for gas in British English | 
        
            | 54. | g________________ | adv. | not sudden; in a gradual way | 
        
            | 55. | a________________ | adv. | in fact |