19．A.progress

　　B．effort

　　C．impression

　　D．money

　　解析：选A。这里是指那位学生的这次来访让作者知道他“进步”很大。

　　20．A.audience

　　B．parents

　　C．students

　　D．speakers

　　解析：选C。那位学生的这次来访让作者意识到作为老师，最主要的是要给“学生”留下长久的影响。

　　Ⅳ.任务型阅读

　　Tuvalu, a tiny country in the Pacific Ocean, has asked for help as it fears it will be swallowed up by the sea.

　　Storms and huge waves are a constant threat and none of Tuvalu's nine little islands is more than five meters above sea level, Salt water is already entering the country's drinking water supply, as well as damaging plants that produce fruit and vegetable.__1__.

　　__2___.Venice, a historic city in Italy best known for its canals, has sunk about 24 cm over the past 100 years.Experts say that it will have sunk another 20－50cm by 2050.A century ago, St.Mark's Square, the lowest point in the city, flooded

　　about nine times a year.Nowadays, it happens more than 100 times.While Venice is slowly sinking into the mud on which it stands, Tuvalu's rising sea level is caused by global warming.

　　The average global temperature has increased by almost 0.5 centigrade degrees over the past century; scientists expect it to rise by extra 1－3 degrees over the next 100 years.

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