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Such changes show that selection and evolution can be controlled,to a certain（ ）,by man．In fact,changes are continually taking place in all livingthings,and new varieties are constantly developing.
A.advantage
B.purpose
C.effect
D.extent
B.purpose
C.effect
D.extent
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参考解析
解析：to a certain extent为固定词组，意为“在某种程度上”。
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