对癫痫患者应用常规脑电图检出痫性放电的阳性率约为（）
A.20%左右
B.30%左右
C.40%左右
D.50%左右
E.60%左右
参考答案：D
Usually I don't allow________in my office，but yesterday I allowed him________ here.
A．smoking；to smoke
B．smoking；smoking
C．to smoke；smoking
D．to smoke；to smoke
Recently, a team of eight medical experts has arrived in Shanxi Province to help to the latest vaccine incident.
A．look at
B．look into
C．look through
D．look on
