用手指在刀刃上横向轻拉，如有（）则表明刀刃很锋利。
A、光滑感
B、涩感
C、快感
D、厚感
参考答案：B
Nowadays parents ____ more and more money on their children's education. [ ]
A. take
B. cost
C. spend
急性杀鼠剂氟乙酰胺中毒，其解毒药是
A．地西泮B．阿托品C．乙酰胺D．维生素K1E．碘解磷定
