111. Trees are cut down merely for fuel and wildlife is killed simply for food. It is time to ____ an end to waste.
| A．call off | B．call for | C．call in | D．call on |
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111. Trees are cut down merely for fuel and wildlife is killed simply for food. It is time to ____ an end to waste.
| A．call off | B．call for | C．call in | D．call on |
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