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【判断题】
网络攻击指的是利用网络存在的漏洞和安全缺陷对网络系统的硬件、软件及其系统中的数据进行的攻击。()A.
正确
B.
错误
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举一反三
【单选题】Claire had her luggage ________ an hour before her plane left. [ ]
A.
check
B.
checking
C.
to check
D.
checked
【单选题】Before making a presentation at the meeting, Caroline had a __ look at her report
A.
brief
B.
complete
C.
short
D.
compact
【单选题】She ________ her hairstyle in her hometown before she came to Chongqing for a better job.
A.
would change
B.
has changed
C.
changed
D.
was changing
【单选题】Before making her change, sofia worked_________
A.
writing books
B.
as a travel agent
C.
for a newspaper
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