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  3. Such changes show that selection and evo

Such changes show that selection and evo

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问题 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.advantageB.purposeC.effectD.extent
选项 A.advantage
B.purpose
C.effect
D.extent
答案 D
解析 to a certain extent为固定词组，意为“在某种程度上”。
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