— I put on my scarf and hat. Why?

— ________________________[ ]

A. Because it's hot outside.

B. Because it's cold outside.

C. Because I am hot.

D. Because I am hungry.

下列（）是神经性毒剂。

A、沙林和维埃克斯

B、芥子气

C、西埃斯和苯氯乙酮