改错题。

     For different reasons，people are pouring into big cities，which cause much more trouble

than expected.As the growth of the population，city problems are grown day by day.To begin

with，big cities are becoming so crowded that it makes find jobs very difficult.As a result，

people without jobs are likely to become danger to our society.In additional，the environment

is getting worse and worse，but there is pollution and traffic problems as well as.We can’t

choose but face with them.In my opinion，big cities need to control the population to help

develop itself for the future.In terms of improving the environment, every citizen should be

called on to contribute to protect the environment.

在下列几种排序方法中，要求内存量最大的是（）。

A. 插入排序

B. 选择排序

C. 快速排序

D. 归并排序