单项选择题

A．Physics.
B．Mathematics.
C．Environmental science.
D．Life science.
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单项选择题
A．Everyone enjoyed himself at John’s parties.B．The woman didn’t enjoy John’s parties at all.C．It will be the first time for the man to attend John’s party.D．The woman is glad to be invited to John’s house-warming party.
A．Everyone enjoyed himself at John’s parties.
B．The woman didn’t enjoy John’s parties at all.
C．It will be the first time for the man to attend John’s party.
D．The woman is glad to be invited to John’s house-warming party.
填空题
With repeated hackers’ attack on your system, ___________________ (我们正逐渐意识到请一位计算机安全专家的必要性).
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