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选择填空（ ）
39.________ Un report says in 1990 ________ number was over five billion.
A.The,a B.An,the C.A,the D.A,a
40.-Must I finish the work before supper?
-__________.
A.No,you mustn’t B.Yes,you need
C.Yes,you may D.No,you needn’t
41.If you don\'t know the meaning of a word,you should _______ in the dictionary.
A.look it up B.look it over C.find it out D.look for it
39.________ Un report says in 1990 ________ number was over five billion.
A.The,a B.An,the C.A,the D.A,a
40.-Must I finish the work before supper?
-__________.
A.No,you mustn’t B.Yes,you need
C.Yes,you may D.No,you needn’t
41.If you don\'t know the meaning of a word,you should _______ in the dictionary.
A.look it up B.look it over C.find it out D.look for it
