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问题详情：Ishumanbloodallthesame?“Yes．”Youmaysay．“It’sallred．”Well，it’snotassimpleasyoumightthink．Bloodismadeupofdifferentparts，suchasredbloodcells（红血球），whitebloodcellsandplatelets（血小板）．Twochemicalmolec...

问题详情：完形填空Doyouoftenthinkofyourparents?Youmaysay,“Ofcourse,I    1   .IbuyapresentformymotheronMother’sDayandonFather’sDayIgivemyfather    2   ,too.”Butwhatabouttheotherdaysofth...