流感病毒感染可用（）
A.更昔洛韦
B.齐多夫定
C.利巴韦林
D.氟胞嘧啶
E.干扰素
参考答案：C
—May I speak to John?
—Sorry, he__________ Japan. But he__________ in two days.[ ]
A. has been to; will come back
B. has gone to; will be back
C. has been in; would come back
D. has gone to; won’t come back
在无固相完井液和低固相钻井液中降滤失和增粘作用最好的是（）。
A、SK－1
B、SK－2
C、SK－3
D、没有
