which引导的从句

　　There are two points which I wanted to make.

　　我想要指出的有两点。

　　We are still friends, though, which is good.

　　不过我们仍然是朋友，这令人感到欣慰。

　　Which part of Japan do you come from?

　　你是日本哪个地区的`人？

　　There is some noise in the data which needs to be reduced.

　　资料里有一些需要删除的不适用信息。

　　Which is the largest city in the world?

　　世界上最大的城市是哪个？