轻中型溃疡性结肠炎治疗的首选药物是
A．肾上腺皮质激素
B．柳氮磺胺吡啶
C．免疫抑制剂
D．抗生素
E．抗胆碱药物
参考答案：B
______ different life today is from ______ it was fifty years ago.
A．What a; what
B．What a; how
C．How; what
D．What; what
负荷率
