Many activities will be held __________ the visiting guests from America.

A．in memory of

B．in honor of

C．in place of

D．in search of

寒潮冷锋过境，主要气象要素的变化为（）。

A.气压剧降、风向不变、风速增大

B.气温剧降、狂风暴雨

C.气温剧降、风向改变、风速增大

D.气压剧降、风向改变、湿度增大