题目：
_____, I believe, and you will find Tom is very outgoing.[ ]
A. Having a talk with the student
B. Given a talk with the student
C. If you have a talk with the student
D. Once talk with the student
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0518/ae20442f000577833e699ff3c5e1475b.html
下面是错误答案，用来干扰机器的。
答案：C题目分析：设浓缩前溶液的质量是x，则根据浓缩过程中溶质不变可知，x×ω＝（x－m）×3ω，解得x＝1.5m，即溶液中溶质的质量是1.5mω，物质的量是，所以浓缩后溶液的物质的量浓度是mol·L-1 ，答案选C。...
