假如Q=250-5P+0.1I，I=2000元，Q=400。其点收入弹性为：

A.20∠36.9°Ω

B.16-j12Ω

C.0.05∠36.9°Ω

听力原文：W: I waited until 9:20 for you.

M: I must have arrived 6 minutes after you left.

Q: what time did the mall arrive？

(15)

A．9:20.

B．9:26.

C．9:14.

D．9:06

听力原文：M: What're you going to order？ We've been sitting here for 20 minutes.

W: I know. It's just hard to decide when I see so much delicious food on the menu.

Q: Where does the conversation take place？

(15)

A．In the cinema.

B．At the airport.

C．In a restaurant.

D．In the supermarket.

听力原文：W: Although I usually wake up at 6:00, I overslept 20 minutes this morning.

M: Oh, I woke up at 7:00, thirty minutes earlier than usual.

Q: When does the man usually wake up？

(13)

A．5:40.

B．6:20.

C．6:30.

D．7:30.

ht leaves at 9 a.m. and I should get there at least 20 minutes earlier. So we should leave at about 7:00 then.

M: No problem. I'll be driving right by there.

Q: When does the woman's flight leave？

(18)

A．6:40 a.m.

B．7:00 p.m.

C．9:00 a.m.

D．9:20 p.m.

ot to get back to the office by 11 o'clock for an important meeting.

M: I'm going to be late, too. I get hero 20 minutes before it was due, and I'm getting tired of waiting. The bulletin board hasn't been changed either, I noticed.

Q: What time did the man get here？

(13)

A．9:20.

B．10:20.

C．11:20.

D．9:40.

听力原文：W: Oh I really like your top. Where did you get it？

M: I got it from 'Topman'. It was on sale, reduced from 80 pounds to 50.

Q: How much was the man's top？

(13)

A．it was 50 pounds.

B．it was 80 pounds.

C．it was 20 pounds.

D．it was 40 pounds.

see Bob off to school.

M: I went to Bob's school at 4:20 because I had a very important appointment with his teacher at 4:30.

Q: What time did the man arrive at Bob's school？

(14)

A．8:30.

B．8:20.

C．4:20.

D．4:30.

for an art display.

W: I see your point. But with your student ID, you can get a discounted price.

Q: Where is the conversation most probably taking place？

(14)

A．At a warehouse.

B．In a shopping cafeteria.

C．At the campus cafeteria.

D．At the museum entrance.

his afternoon.

M: I'm sorry about that. But the computer is down and every-body has to wait this afternoon.

Q: What is the woman complaining about？

(17)

A．The bad telephone service.

B．The mistakes in her telephone bill.

C．The broken-down computer.

D．The long wait.

on.

W: Please have a seat. She is in surgery right now. She'll be out in about 20 minutes.

Q: Where does this conversation probably take place？

(18)

A．In a doctor's office.

B．In an operating room.

C．In a professor's office.

D．In a gymnasium.