听下面一段独白，回答以下小题。
【小题1】Who is the speaker?

A．A student.

B．A headmaster.

C．A geography teacher.

【小题2】When will they leave?

A．At 8 a. m..

B．At 7 a. m..

C．At 6 a. m..

【小题3】What does the speaker ask the students to do after the trip?

A．Look at different kinds of rocks.

B．Write a report.

C．Pick some plants.

【小题4】What will help the students tell the kinds of rocks?

A．A piece of paper.

B．A book.

C．A plant.