What's             present Jenny             on her birthday?[ ]

A. best; has received

B. the best; have received

C. best; have received

D. the best; has received

大气污染状况监测中，下列哪一项不是点源监测的布点方法

A．捕捉烟波采样
B．烟波下方采样
C．棋盘式布点
D．四周布点
E．扇形布点