（）是专门为铁路设计的专业无线数字通信系统。 A.GSM-R B.TCC C.RBC

第二节选词填空（共10小题；每小题1分，满分10分）
根据句意，选择适当的词并用其恰当的形式填空。

popular       pollution       ancestor        solve      apology educate       horror         poor           convince   attraction

66.   The government should pay more attention to the research on _____. The kids are the future of our homeland.
67.   Their _____ came from China. They are always dreaming of coming back to their motherland some day.
68.   With combined effort, we are sure to find a _____ to the problem.
69.   The weather this week is really _____; the sun never shows up and it is very windy sometimes.
70.   I finally _____ him of my innocence.
71.   Although he enjoyed great _____, he is never too proud of himself.
72.   20% of the population live below the _____ line while many live a luxurious(奢华的) life.
73.   It is impolite of you to speak to him that way. You should _____ to him.
74.   The lecture on “How to learn English Words” _____ many students.
75.   The government intends to move out the factories that _____ the air and water.