题目内容

Section A
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and the questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices A , B, C, and D.
听力原文:W: You look so nice with this shirt on, Hill
M: Thanks, Jenny. But I want to try some other colors.
Q: What is the man doing?
(1)

A. Talking about clothes with his friend.
B. Doing shopping with his friend.
C. Receiving a gift from his friend.
D. Chatting with his friend.

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有三个关系R,s和T如下:
其中关系T由关系R和S通过某种操作得到,该操作为

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C. 交
D. 并

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B. 错误

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A. 正确
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A. 净现值法进行比选,且乙方案更佳
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