引起肝性脑病的发病原因为()
A.中毒性肝炎
B.病毒性肝炎肝硬化
C.门体分流手术
D.重症病毒性肝炎
E.血吸虫病性肝纤维化
参考答案:A, B, C, D
下列计算中,正确的是( )
A.(a-b)2=a2-b2
B.a3•a2=a6
C.a3÷a2=a
D.(a3)3=a6
Mary is _____ and she often makes her classmates laugh. [ ]
A. shy
B. pretty
C. busy
D. funny