风筒出风处距回收地点不得大于（）米。
参考答案：5米
长方形的长为a，宽为b，则它的周长是______，面积是______．
—I'll go to Hainan for a holiday next month.
—____________.[ ]
A. Sorry to hear that.
B. Have a nice time !
C. Oh, you can go there by train.
D. You must get wrong.
