–I want to make a kite to fly.

-- __________  You can easily buy one on the market.

A．Why not?

B．Good idea.

C．Why bother?

D．No way!

各级防汛指挥机构和承担防汛抗洪任务的部门和单位，必须根据（）做好防汛抗洪准备工作。