皮皮学，免费搜题
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【判断题】
局域网或广域网通常是为了一个单位或系统服务的,而城域网则是为整个城市而不是为某个特定的部门服务的。 A. 对 B. 错A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】The main purpose of this advertisement is to______.
A.
encourage more people to attend the Forum in time
B.
promise everyone can pay less money to attend the Forum
C.
call on the people in the north of the USA to go south for holidays
D.
introduce some new activities and topics of the Forum
【单选题】The purpose of the writer is to______.
A.
introduce a new flu theory
B.
report a test on one flu theory
C.
compare the various flu theories
D.
point out a new approach to flu study
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