单项选择题

A．To protect environment.
B．To cool buildings.
C．To change the climates.
D．To provide drinking water.
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单项选择题
A．They help the students to become more cooperative.B．They are very good entertainment for students.C．They make lots of money buy selling tickets.D．They help the students to build good teams.
A．They help the students to become more cooperative.
B．They are very good entertainment for students.
C．They make lots of money buy selling tickets.
D．They help the students to build good teams.
填空题
incredible
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