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浦肯野细胞动作电位O期去极化是由于E．

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听力原文：M: How much are these sweaters？
W: They're on sale today, sir. Twenty-five dollars each, or two for forty dollars.
Q: How much does one sweater cost？
(4)

A. Twenty dollars.
B. Forty dollars.
C. Twenty-five dollars.
D. Fifty dollars.

M: That's one dollar if it is not overweight.
W: How about postcards？
M: That will cost you 80 cents.
W: Well, will you first weigh this letter for me？
M: OK. The letter is 10 grams overweight, Madam. You'll have to pay 20 cents extra for the overweight.
W: Here you are. And I want to buy a 30 cent stamp.
M: Well. One 30 and 20 cents extra, that will be $1.50 altogether.
W: Here's $2.
M: OK. Here's your change. Have a nice day!
W: Thank you!
(17)

At the airport.
B. In a post office.
C. In a store.
D. At a receptionist.

M: That's one dollar if it is not overweight.
W: How about postcards？
M: That will cost you 80 cents.
W: Well, will you first weigh this letter for me？
M: OK. The letter is 10 grams overweight, Madam. You'll have to pay 20 cents extra for the overweight.
W: Here you are. And I want to buy a 30 cent stamp.
M: Well. One 30 and 20 cents extra.., that will be $1.50 altogether.
W: Here's $2.
M: OK. Here's your change. Have a nice day!
W: Thank you!
Q8: Where does this conversation most likely take place？
(14)

At the airport.
B. In a post office.
C. In a store.
D. At a receptionist.

A．She typed a paper.B．She went to bed.C．She visited her aunt.D．She tried to study hist

A. She typed a paper.
B. She went to bed.
C. She visited her aunt.
D. She tried to study history.