题目：
Suppose a foreign friend of yours has written to inquire about the possibility of making a seven-day visit in China. Write a reply to give him some information. The following should be included:
(1) The place you recommend for him to visit and the reasons ;
(2) The suggested route and the timetable of the visit;
(3) Some advice on how he should prepare for the visit;
(4) Your arrangement for his visit to Beijing.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：利用两性电解质你等电点是溶解度最低以及不同的两性电解质有不同的等电点这一特性，使酶与杂质分离。
