Jack ______ a bus to school every morning. [ ]
A. takes
B. brings
C. likes
D. runs
答案:A
口腔非特异性免疫体系中组成化学屏障的除了()
A.硫氰酸盐
B.乳铁蛋白
C.IgG
D.硝酸盐
E.IgM
用于获得字符串Str从第2个字符开始的3个字符的函数是( )。
A.Mid(Str,2,3)
B.Middle(Str,2,3)
C.Right(Str,2,3)
D.Left(Str,2,3