Can this book ______ without a dictionary? [ ]
A. to read
B. be readed
C. be read
答案:C
手术患者一般在术前12小时开始禁食、4小时开始禁饮的理由是( )
A.让胃肠道适当的休息
B.防止麻醉或手术过程中发生呕吐
C.减少胃肠道手术时的污染
D.防止术后腹胀
E.减少术后排便
隔水层