糖皮质激素首选用于（）
A.镰状细胞贫血
B.遗传性椭圆形细胞增多症
C.海洋性贫血
D.阵发性睡眠性血红蛋白尿
E.温抗体型溶血性贫血
参考答案：E
The young tribal man helped Mrs. Davidson find her way back, in return for________medical equipment was offered to him by the latter.
A．that
B．whose
C．which
D．whom
依据合同当事人相互间的义务可将合同划分为（）。
A.明示合同
B.双务合同
C.单务合同
D.暗示合同
