题目

短文填空 根据短文内容，选择适当的单词或短语填空，使短文意思完整。每个选项至多使用一次，有两项剩余。 A. first    B. touching    C. another    D. bought  E. wherever  F. opens   G. whenever    H. talking    I. but also    J. other “ Thank you” is widely used in a modern society. It is a very good manner. You should say “Thank you”  1  others help you or say something kind to you. For example, when someone       2  the door for you, when someone says you have done your work well, when someone says you hav已知变量x，y满足约束条件x+y≥1y≤3x-y≤1，若z=kx+y的最大值为5，且k为负整数，则k= ．