题目

--- Zhao Rui, it’s said that many famous singers will come to Yangzhou on April 18th.How about watching the evening show there? --- ________! Let’s ask Huang Tao to go with us. A．Best wishes          B．Sounds great      C．Good luck      D．That’s OK 答案：B下列哪种生物可以监测空气的污染程度（    ） A．葫芦藓     B．海带       C．肾蕨        D．满江红