Li Lei's parents _____ teachers in a middle school. [ ]
A. be
B. am
C. is
D. are
答案:D
某同学测量物体的长度,四次测量结果分别是5.51cm,5.51cm,5.53cm,5.55cm,则这个物体的长度应记作( )
A.5.51cm
B.5.52cm
C.5.525cm
D.5.53cm
华支睾吸虫主要寄生于()
A.胆总管
B.肝胆管
C.肝脏
D.胆囊
E.胰管