皮皮学，免费搜题
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【单选题】
After years of research, scientists have ______ the virus that is responsible for the disease.
A.
recognized
B.
identified
C.
guaranteed
D.
notified
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participate in a celebration
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make an adventure in the sea
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There is no one to teach them how to do it.
B.
Not very many students are interested in it.
C.
The college doesn't have any rock-climbing equipment.
D.
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【单选题】在给主机设置 IP 地址时,那一个能使用 ( )
A.
29.9.255.15
B.
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D.
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192.5.91.255
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