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【单选题】
当一台主机从一个网络移动到另一个网络时，（ ）说法是正确的。A.
必须改变IP地址和MAC地址
B.
必须改变IP地址，但不需要改动MAC地址
C.
必须MAC地址，但不需要改动IP地址
D.
MAC地址和IP地址都不需要改动
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举一反三
【单选题】A new survey shows that 54% of Americans do not take prescription medicines _______ though they are important to their health. [ ]
A.
as they instruct
B.
as were instructed
C.
as to be instructed
D.
as instructed
【单选题】The author tells us in paragraph 4 ______.
A.
the reasons for keeping medicines at home
B.
people's doubt about taking drugs
C.
what kind of medicine people should prepare at home
D.
the possible harms self-medication may do to people
【简答题】填充命令命令的快捷键[填空(1)]
【单选题】With science and technology advancing, plentiful kinds of medicines are being developed to _____ us of our pain caused by diseaese.
A.
cure
B.
remove
C.
relieve
D.
reduce
【单选题】Suppose a new vaccine for Lyme disease is developed by Merck, a large drug company. Which of the following is most likely to occur?
A.
Merck will apply for a patent on the vaccine that grants it the monopoly rights to the vaccine for many years.
B.
Merck will have a monopoly on this vaccine because of economies of scale.
C.
Other firms will quickly copy the formula making the market for the vaccine competitive.
D.
Merck will not tell anyone about its discovery though it will sell the vaccine.
【简答题】“填充”命令的快捷键
【单选题】A new survey shows that 54 percent of Americans do not take prescription medicines ________ though they are important to their health. [ ]
A.
as they instruct
B.
as were instructed
C.
as to be instructed
D.
as instructed
【简答题】By and large, people in the United States suppose that people from other cultures also dislike poverty and value hard work.
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