单项选择题

When using a browser to access the homepage of a university ’s WEB website, the protocol that is IMPOSSIBLE to use is ( ).
A、SMTP
B、HTTP
C、UDP
D、ARP

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A、A.钝化酶
B、B.抑制微生物的繁殖
C、C.抑制褐变
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A ____ of events were caused by the traffic accident. A.
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