This year is the 49th Earth Day and I think we should people not to too many trees．（ ）
| A． |
call on； cut down |
| B． |
call at； cut up |
| C． |
call in； cut off |
This year is the 49th Earth Day and I think we should people not to too many trees．（ ）
| A． |
call on； cut down |
| B． |
call at； cut up |
| C． |
call in； cut off |
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