问题
选择题
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
答案
B
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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
B