主含蒽醌类衍生物的药材是（）
A.五味子
B.枳壳
C.决明子
D.吴茱萸
E.巴豆
参考答案：C
You should read the article as ____ as I do to know what the writer really wants to tell us.
A．careful
B．more careful
C．carefully
D．more carefully
各电阻率曲线在地层处不得出现零值和负值。
