【答案】　B

　　4．What it is the main purpose of this passage?

　　A．To criticize those big companies that ruin the earth.

　　B．To ask people to save kids from the harm done by pollution.

　　C．To give kids plenty of entertainment in a clean environment.

　　D．To call on people to stop ruining the earth.

　　【解析】　根据最后一段最后一句“So stop and think about what you can do to make a difference to our world！”并结合全文的主要内容可知，本文主要是呼吁人们行动起来保护地球。故选D项。

　　【答案】　D

　　B

　　The first class of the semester began with the students introducing themselves to their classmates.Lizzie Valverde，a student from New Jersey，told everyone that she'd been adopted as a child.As Lizzie filled in more details about her life，another student，Katy Olson，from Iowa，began to take notice：

　　“It fits together with a lot of facts that I know.I realized that the classmate across the table could be my real sister.”Ms.Olson said，“I have searched for the information online about my birth mother's identity.Surprisingly，I found that my mom may have an elder daughter，who seemed to be a student at Columbia.”Ms.Olson tried to get in touch with that elder sister but she failed；now she appeared in the same class.

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