如酸性清洁剂与皮肤接触后，应（）处理。
A.迅速用抹布擦掉
B.迅速用清水冲洗
C.迅速用温水冲洗
D.迅速用碱性清洁剂中和
参考答案：B
My father isn’t in good health now. I think he should pay attention____ exercise.
A．to take
B．for taking
C．to taking
D．in taking
IPv6是下一代IP协议。IPv6的基本报头包含______个字节，此外还可以包含多今扩展报头。
A) 16 B) 32 C) 40 D) 60
