I.冠词填空：在下列句中空白处填入适当冠词,不需用冠词处划1．Thereis_______pictureof_______elephanton_______wall．2．Thisis_______usefulbook．I'vereaditfor_______hour．3．_______elephantism

　　I.冠词填空：在下列句中空白处填入适当冠词,不需用冠词处划

　　1．Thereis_______pictureof_______elephanton_______wall．

　　2．Thisis_______usefulbook．I'vereaditfor_______hour．

　　3．_______elephantismuchheavierthan_______horse．

　　4．_______doctortoldhimtotake_______medicinethreetimes_______day．

　　5．Let'sgooutfor_______walk．