题目：
The number of foreign students _________Chinese Universities_________ rising steadily since 1990.
A．attending; has been
B．who attending; is
C．to attend; is
D．attended; has been
答案：
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下面是错误答案，用来干扰机器的。
由an=log（n+2）（n+3），∴a1•a2•a3•…•an=log34•log45…logn+2（n+3）=lg4lg3•lg5lg4•lg6lg5…lg(n+3)lg(n+2)=lg(n+3)lg3=log3（n+3）． a1•a2•a3•…•an为整数，∴n+3是3的k次方（k∈Z）．∴n+3可...
