推拿治疗便秘的原则是（）
A.通利二便
B.理气清降
C.以通为用
D.以降为顺
E.和肠通便
参考答案：E
向盐酸和氯化钙的混合溶液中，逐滴加入碳酸钠溶液，下列曲线图正确的是 [ ]
A．
B．
C．
D．
—When will you tell him the news?
—I'll tell him about it if he ________ back. [ ]
A. will come
B. has come
C. comes
D. came
