听一段材料，回答下面几个小题。Which of the following can be found in the national parks?
A. Animals.
B. Lakers.
C. Both A and B.How do they go to the camp sites?
A. By cycling.
B. By walking.
C. By driving.Why do people enjoy camping?
A. Because they can relax and enjoy a quiet life.
B. Because they like the conveniences there.
C. Because they can live in tents in the camp sites.What conveniences do campers in trailers have?
A. They can have a party there.
B. They have electricity and hot water.
C. They can swim in them.
听一段材料，回答下面几个小题。What's the probable relationship between the two speakers?
A. Salesperson and customer.
B. Old school friends.
C. Fellow workers.What do we know about the woman in the dialogue?
A. She is fond of her work.
B. She's tired of traveling.
C. She is interested in law.
听一段材料，回答下面几个小题。What's the relationship between the two speakers?
A. Teacher and student.
B. Boss and employee.
C. Husband and wife.What happened to the man?
A. He failed his final test.
B. He was out of work.
C. He gave the students a hard final.
When did the man arrive?
A.8:00.B.8:30.C.8:45.
Where does the conversation take place most probably?
A. At a bus stop.
B. At a railway station.
C. In a bank.
Why will the woman not go to the zoo tomorrow?
A. The man's son is too young.
B. She will attend a meeting tomorrow.
C. It'll snow heavily.