急性重型肝炎的病变有()
A.肝细胞大片坏死
B.肝细胞再生
C.纤维增生
D.炎细胞浸润
E.假小叶形成
参考答案:A, D
a为有理数,则下列各式成立的是( )
A.a2>0
B.a2+1>0
C.-(-a)>0
D.-a2<0
"Joe could swim when she was only four years old."
"______ clever the girl was!" [ ]
A. How
B. What a
C. What
D. How a