C．shows his/her opinion

　　D．gives people a warning

　　【解析】　推理判断题。作者最后一段提到“家庭绿色植物”的好处，表明了自己的观点。

　　【答案】　C

　　4．Which is the following shows the structure of the passage?

　　A．①→②→③→④B．①→②　③→④

　　C．①→②　③　④

　　D．①　②　③→④

　　【解析】　段落结构题。文章第一段总括说明，第二、三段介绍“研究”；第四段提出个人观点。

　　【答案】　B

　　B

　　The National Park Service in the United State will mark its one hundredth anniversary in 2016.As it nears its second century，the Park Service plans to increase its educational programs for students and teachers.

　　The plans include transportation support for one hundred thousand students each year to visit national parks to learn about nature and history.Yellowstone is believed to have been the world's first national park when it was established in 1872.Other students will get a chance to see parks in faraway places through Skype and other online programs.

　　The National Park Service also works with partners to provide education.One of its partners is a nonprofit organization called NatureBridge.NatureBridge is celebrating its fortieth anniversary and says one million young people have taken part in its programs.The organization works with students from kindergarten through twelfth grade and uses national parks as its classrooms.It provides field science programs at Yosemite National Park and four other locations in California and the northwestern state of Washington.

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