用高锰酸钾—过硫酸钾消解处理固体废物样品时，应采用的加热方式为（）

A.近沸保温法

B.煮沸法

C.A+B

Directions:

You are to inform Mrs. Benton that you will have to break the dinner engagement.

Write a note to

1) make an apology,

2) state your reasons and

3) hope to meet in the near future.

You should write about 100 words on ANSWER SHEET 2. Do not sign your own name. Use "Li Ming" instead. You do not need to write the address.