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平面中4个点P1,P2,P3,P4，在某个球面上，且P1P2=P2P3=P3P4=P4P1=3，已知球心到该平面的距离是该球半径的一半，则该球的体积是()．

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Section B
Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. The conversations and the questions will be spoken only once. When you hear a question, you should choose the correct answer from the 4 choices marked A, B, C, and D.
听力原文：M: Excuse me, I'd like to go to the Post Office, but I don't know how to use this ticket machine.
W: Well, just press this button. It is 2 dollars.
M: Thanks.
W: The train is coming soon. Please wait a moment,
M: All right. How often do the trains come at this time of the day？
W: Usually it comes about every six minutes.
M: OK, and where should I get off？
W: Just get off at the Post Office Station. That's five stops from here.
M: I've got it. Thanks for your help.
W: You are welcome.
(6)

A. To the Post Office.
B. To the History Museum.
C. To the Art Museum,
D. To the Space Museum.

John Montagu couldn't have imagined ______.

A. sandwich would still be very popular almost 250 years later
B. sandwiches are commonly carried to school or work in lunchboxes or brown paper bags to be eaten for lunch
C. sandwiches are easy to clean-up after, nutritious and come in hundreds of different kinds
D. you can put everything you want inside a sandwich

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下列函数中，既是奇函数又在[-1,1]上单调递减的是()．

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The long-lasting popularity of sandwich lies in ______.

A. their convenience and fast preparation time
B. their cheap and delicious
C. putting everything you want inside a sandwich
D. hundreds of different kinds

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