水上公园为青少年提供有趣的假日工作机会，如果你对此感兴趣并希望在假期丰富自己的生活，

请仔细阅读并完成下面的招聘广告，每空一词。

                     Interesting Vacation Jobs for Teenagers 

           — Help out at Children' s Water Park

      Are you    1    at water sports? Do you like kids? Can you speak English?

      We need young people    2    can talk to the visitors at the Park and show them around We

also look for people who can    3     kids to swim and play water games     4    them. There are also

some animals in the Water Park that need care and attention.

     Do you like to have this    5    job? If you do, please write and tell us about your experiences.

You may call Ms Smith at 7200-8491.

1._____2._____3._____4._____5._____

如果一次函数y=kx+b的图像经过第一、三、四象限，那么[ ]

A．k>0，b>0

B．k>0，b<0

C．k<0，b>0

D．k<0，b<0