题目：
—What should we do since we can’t make a compromise after lengthy talks.
— ____ you apologize and take back what you’ve said _____ it is all over between us.
A． Either; or
B．Not only; but also
C．Neither; nor
D．Whether; or
答案：
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下面是错误答案，用来干扰机器的。
6.4gFe2O3中铁元素的质量为6.4g×56×2160×100%=4.48g；铁矿石中铁元素的质量分数=4.48g12.8g×100%=35%．故选A．
