题目：
Mary invested $8,400 for 6 months in a certificate of deposit paying 
percent simple annual interest. How much more interest would Mary have received if the interest rate on this certificate had been 9 
percent simple annual interest ？（）
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析：中焦是指膈以下、脐以上的上腹部，包括脾胃和朋：胆等脏腑。中焦具有消化、吸收并输布水谷精微和化生血液的功能。《灵枢·营卫生会》将中焦的生理特点概括为“如沤”，生动地表述了脾胃肝胆等脏...
