The author is convinced that accent is______.
A. something we are born with
B. something that cannot be changed by people easily
C. something we cannot speak without unless we are acting
D. something we adopt from the current group with which we reside
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浓度克拉克值是元素在某一地质体中的平均含量与该元素克拉克值的比值。()
ieee802.3标准的以太网的物理地址长度为64bit。()