Today I’m no longer a child，but I’m worried about what kind of environment my children will grow up in.I know change is possible，because I am changing，still figuring out what I think.I am still deciding how to live my life.The challenges are great，but if we accept individual responsibility and make choices，we will rise to the challenges，and we will become part of the positive tide of the change.I hope this goal will be met through our common efforts.Thank you all.

　　54．The purpose of what the speaker said at the age of 12 was to________.

　　A．end poverty and make schools beautiful

　　B．find environmental answers and show off

　　C．focus people’s attention on some social problems

　　D．find a wonderful place and clean it up

　　55．What does the underlined word “ovation” in the second paragraph refer to?

　　A．A long period of laughing.

　　B．A cold and unfriendly welcome.

　　C．An expression used for greeting.

　　D．Great applause or cheering.

　　56．The information in the text is presented mainly through________.

　　A．question and answer

　　B．a personal lecture

　　C．cause and effect

　　D．listing steps in a process

　　57．Which of the following best describes the speaker?

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