—I hear Xiao Shenyang will come to Suqian.

—Really? _______ he comes, I will be very happy because I'm a big fan of him. [ ]

A. If

B. Until

C. Unless

D. After

关于卡介苗，下列说法不正确的是（）

A.卡介苗可降低小儿结核的患病率和死亡率

B.新生儿及结核菌素试验阴性的小儿应接种

C.是活的无致病毒力的牛型结核菌

D.急性传染病恢复期可接种卡介苗

E.用皮内注射法