This year marks Earth Day's 50th birthday． It was created to remind people to ________ the earth﹣the home to all the living things．（ ）
| A． |
talk about |
B． |
care about |
C． |
hear about |
This year marks Earth Day's 50th birthday． It was created to remind people to ________ the earth﹣the home to all the living things．（ ）
| A． |
talk about |
B． |
care about |
C． |
hear about |
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