18.A　根据空后的“this is not enough to solve our problem”可知,空前后为转折关系。

　　19.D　根据空前的“Maybe there is another way out.”可知,我们需要修理我们的物品,而不是扔掉它们。

　　20.A　根据下文可知,我们也要再次考虑我们的消费态度。

　　二、七选五阅读填空(共5小题;每小题2分,满分10分)

　　Learn to think

　　“I will think of it.” It is easy to say this.　1　 We can not see our thoughts,or hear,or taste,or feel them;and yet what mighty power they have! 

　　Sir Isaac Newton was seated in his garden on a summer’s evening,when he saw an apple fall from a tree.　2　 Later,he discovered how the earth,sun,moon,and stars were kept in their places. 

　　3　 He began to think;he wanted to find out why the steam in the kettle moved the heavy lid.From that time he went on thinking and thinking.When he became a man,he improved the steam engine so much that it could,with the greatest ease,do the work of many horses.　4　  

　　A man named Galileo was once standing in the cathedral of Pisa,when he saw a chandelier swaying to and fro.This set him thinking,and it led to the invention of the pendulum.

　　Boys,when you have a difficult lesson to learn,don’t feel discouraged,and help yourselves before asking someone to help you.　5　  

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