Based on the passage, all of the following are mentioned as part of a tree that can help find minerals EXCEPT FOR（）

单项选择题4（）

A．it
B．that
C．this
D．one

单项选择题What may be the best title for this passage（）

A．How to Complete a Job Application Form
B．An Introduction to Job-Hunting Situations
C．Writing Skills Help Job-Hunting
D．An Attempt to Find Better Jobs