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【单选题】
下列选项中，哪一项不是防火墙的作用。A.
过滤有害信息和服务
B.
防止攻击者接近设备
C.
防止来自内部的破坏
D.
对内外网之间的通信进行监控审计
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反馈参考答案：
举一反三
【单选题】How many hours do the researchers advise people to spend doing weekly physical exercises?
A.
one hour.
B.
two hours.
C.
one and half.
D.
two and half.
【单选题】--- How _____ hours do you sleep a day? --- Well, about eight hours. But how _____ sleep do we students really need?
A.
many; many
B.
much; much
C.
much; many
D.
many; much
【单选题】Listen to the dialogue about study hours. Q: How many hours do students study in South Korea?
A.
6 hours.
B.
10 hours.
C.
9 hours .
D.
15 hours.
【多选题】建设工程施工职业健康安全管理的目的有( )。
A.
保证建设工程成本和质量目标的实现
B.
防止和减少生产安全事故
C.
直接获得经效益，提高企业盈利能力
D.
控制影响工作场所内访问者和其他人员的健康和安全的条件和因素
E.
考虑和避免因管理不当对员工健康造成的危害
【单选题】How many hours do the researchers advise people to spend doing weekly physical exercises?
A.
One hour.
B.
Two hours.
C.
One and half.
D.
Two and half.
【单选题】听力原文：W: What sort of hours do you work, Steve? M: Well I have to work very long hours, about eleven hours a day. W: What time do you start? M: I work 9 to 3. Then I start again at 5:30 and work until ...
A.
It allows him to make a lot of friends.
B.
It requires him to work long hours.
C.
It enables him to apply theory to practice.
D.
It helps him understand people better.
【单选题】______hours do you exercise every week ? Nine hours.
A.
How many
B.
How often
C.
How much
D.
How long
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