阅读，让我们chù____摸经典，对话智者。我们在书海中遨游，línɡ____听圣哲的教诲，体悟睿智的思辨。从今天起，让心灵在书jí____中旅行，我们的校园就会书香弥màn____，我们的生活就会诗意盎然。

    Li Daiyu and Liu Qian were on a trip to Canada. At 8 o'clock, their friend, Danny Lin,____(Wait) there when they appeared. On the way ____the station, they chatted about the trip. “____(go) eastward, you'll pass mountains and millions of lakes and forests. Remember the fact____Canada is 5,500 kilometers from coast to coast. Vancouver, in Canada's warmest part, is Canada's most beautiful city,____(surround) by mountains.

    Skiing in the Rocky Mountains and sailing in the harbour make it one of Canada's most popular cities ____(live) in. Its population is increasing ____(rapid). Another city, Toronto, is the biggest and most ____(wealth) city in Canada. They could see the misty cloud that rose from the great Niagara Falls in ____distance. Montreal is a city with wonderful restaurants and clubs. Most of people speak both English and French. In a word,

    Canada is a ____(mix) of many cultures and races. Have a good time.”

For years，scientists have been worried about the ________ of air pollution on the earth's natural conditions. （   ）

桃花在花托上有四个部分，从内向外依次是 (     )。
①花瓣 ②雄蕊 ③萼片 ④雌蕊