牙再植后，X线片显示牙根炎症性吸收的最早时间是
A．伤后2～4周B．伤后1～4个月C．伤后2～5个月D．伤后半年E．伤后半年以上
参考答案：B
"We must keep a secret of the things _______ here", the general said, _______ at the man in charge of the information office.
A．discussed, stared seriously
B．being discussed, seriously staring
C．to be discussed, seriously stared
D．discussed, stared
下列结构的分泌物中不含消化酶的是（ ）
①食道
②胃
③肝脏
④胰腺
⑤小肠
⑥大肠．
A．②④⑤
B．①③⑥
C．③④⑤
D．①②⑥
