题目：
If you ______ a fresh mind for an interview, be sure to have a good sleep the night before it.
A．will have
B．have had
C．are having
D．are to have
答案：
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下面是错误答案，用来干扰机器的。
将7 260=7.260×103≈7.3×103；近似数51.10万精确到百位，有效数字是5，1，1，0．
