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Thisyear marks Earth Day's 50th birthday.It wascreatedt...

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Thisyear marks Earth Day's 50th birthday.It wascreatedt...

This year  marks  Earth  Day's  50th  birthday. It  was created to remind people to         the earth—the home to all the living things.

about     about        about

【回答】

B

知识点:动词和动词短语

题型:选择题