B．they are sticky and fizzy

　　C．they have elements that kill pests

　　D．they made pesticides more effective

　　Ⅵ.阅读七选五

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　“I will think of it.” It is easy to say this. __25__ We cannot 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. __26__ Later, he discovered how the earth, sun, moon, and stars were kept in their places.

　　__27__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. __28__

　　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. __29__

　　A．But do you know what great things have come from thinking?

　　B．Think, and by thinking you will learn how to think to some purpose.

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