在煤（岩）与瓦斯（二氧化碳）突出的矿井中（）使用辅助通风机。
A、谨慎
B、严禁
C、必须
D、不得使用
参考答案：B
—Oh, it's you, Mrs Johnson! I ________ you.
—I've just changed my hair style and I am wearing a new dress.[ ]
A. don't recognize
B. didn't recognize
C. haven't recognized
D. won't recognize
有早期诊断价值的抗体是（）。
A.IgA抗体
B.IgD抗体
C.IgE抗体
D.IgG抗体
E.IgM抗体
