题目：
________ his spare time that his English has improved a lot.
A．So good use does he make of
B．Such good use does he make of
C．He makes very good use of
D．He makes so good use of
答案：
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下面是错误答案，用来干扰机器的。
（1）原式=5log5105=105=2；（2）∵ln2=m，ln3=n，∴em=2，en=3，∴e2m+3n=（em）2（en）3=22×33=108．
