科研之友
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<正>April 22 is The World Earth Day. It’s a day for everyone to care about the Earth. What can we do to keep the earth clean? Many kids have"green tips"to share. Let’s see what they are doing.I take a handkerchief(手帕)with me to school every day.I don’t use tissues(餐巾纸). I help save(拯救)the trees.
