Why does the professor say this:
A．He is showing the students some slides.
B．He does not want the students to ask questions.
C．He wants the students to pay attention.
D．He thinks that the information is very clear.

Why are bacteria being used in the research study at the university？
A．Bacteria have unusual cell formations.
B．Bacteria live harmlessly on the skin.
C．Bacteria are similar to other life forms.
D．Bacteria cause many diseases in humans.

听力原文：We're going to look around the city tomorrow morning.
4
A．I'll try my best to do it.
B．I'm looking forward to that.
C．I feel a little cold in the morning.
D．I haven't eaten my breakfast yet.

What is the lecture mainly about？
A．Provisions of the Homestead Act
B．How to construct a log cabin
C．Frontier homes in the West
D．Early construction materials

A．It was cold.
B．It was a failure.
C．I'm very happy.
D．She is shy enough.

Where would this passage most likely appear？
A．In a magazine specifically for women.
B．In a restaurant and hotel guide.
C．In a news magazine.
D．In a journal for top-ranking businessmen and women.