本文是说明文，说明运动占据很大一部分商业广告。

　　41.答案为D细节理解题。由本文第二段This means the television networks are able to sell advertising time at relatively high prices during what normally would be dead time for programming.可知。其中sellhigh price 与bring more money 是同义重现。

　　42.答案为A细节理解题。结合41题和排除法可以得出答案。其中BCD项的表达都不合常理。

　　43.答案为D细节理解题。由They also realize that most business