服用6种或更多药物的住院老年患者，药物不良反应发生率增加约（）
A.10%
B.17%
C.27%
D.35%
E.50%
参考答案：C
当DTU的（）灯闪烁时，可能为线路故障。
A.LINE，
B.DTR，
C.DCD，
D.TXD。
______ seemed surprising to us was ______ he came out first in the speaking competition.
A．It; that
B．What; what
C．It ; what
D．What; that
