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【多选题】
以下关于ER图的描述中正确的是?A.
ER图也叫实体关系图，用来描述实体之间的关系
B.
ER图一般用在对数据存储做逻辑建模的阶段
C.
ER图一般用来对数据存储做物理建模的阶段
D.
ER图中的两个重要的概念是： 实体，关系
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【简答题】与模拟图像传输相比较,数字图像传输具有哪些优越性?
【单选题】This passage is most possibly chosen from______.
A.
a newspaper about war
B.
a scientific paper about adventures
C.
a textbook on space travel
D.
a magazine for tourists
【单选题】听力原文：M: I'm still waiting for the clerk to come back and make some copies of this paper for me. W: Why bother him? I'll show you how easy it is to operate the machine. What does the woman mean?
A.
The clerk doesn't like to be bothered.
B.
The machine was just repaired.
C.
She can teach the man to work the machine.
D.
The man shouldn't make any more copies.
【单选题】Electronic 'money' refers to ______.
A.
money that denies direct transactions
B.
the bank paper and coins
C.
money issued by the electronic industry
D.
money that is hard to obtain
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