题目内容
（请给出正确答案）
A．The usher.
B．The people sitting next.
C．The people sitting in front of him.
D．The people standing in the back.
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The title of the article may well be ______.
A．the birthplace of the almighty money
B．why people love $
C．the origin of dollar
D．Thomas Jefferson and the US dollar
The main idea of the first paragraph is
A．The economy remains depression.
B．More and more people like to choose online shopping.
C．Shopping center are growing.
D．Online shopping is cheaper than shopping center.
A.The line clock tracing should follow the minimum path requirement.
B.The clock compensation should be given if there are many nodes on the link and each of them extracts the clock from a distance to the near.
C.It is suggested that SSM protocol is used in the whole network (user-defined mode II) to provide clock protection and avoid clock looping.
D.For the clock synchronization scheme of CES service, the PE synchronization mode is the first choice and the adaptive mode is the second choice.
