Earth Day is a reminder that we need to care about the world we live in and that we should learn to life and nature.
A. respect
B. look on
C. care for
D. admire
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(答案→)A. respect
B. look on
C. care for
D. admire
解析：respect“尊重，尊敬”；look on“看待”；care for“喜欢，照顾”；admire“钦佩，赞美”。句意：地球日提醒我们，我们需要关心我们生存的世界，我们也应该学会尊重生命，尊重大自然。故选A项。