Mr. Smith is neighed (近视). One day he is walking in the street. A strong wind (强风) blows his cap off his head (头). Mr. Smith begins to mn after it. An old woman opens her window and speaks to him. 'Hey! What are you doing?' 'Running after my cap? 'Your cap? That's our black cat you ice running after. Them is a cap on the street behind you. ' 'Oh. my dew!' What colour is Mr. Smith's cap (帽子)?