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【单选题】
网络入侵者使用sniffer对网络进行侦听,在防火墙实现认证的方法中,下列身份认证可能会造成不安全后果的是()。
A.
基于口令的身份认证
B.
基于地址的身份认证
C.
密码认证
D.
都不是
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举一反三
【单选题】Lincoln’s mother did ___ many books ___ him.
A.
what she had buy, to
B.
what she could buy, for
C.
all that she had to buy, to
D.
all she could buy, for
【单选题】用直线“ LINE ”命令画出一个矩形,该矩形中有 ______ 个图元实体 。
A.
1
B.
4
C.
2
D.
3
【单选题】用直线(line)命令画出一个矩形,则该矩形包含__________个图形对象。
A.
1
B.
4
C.
5
D.
不一定
【单选题】________ nice flowers ! Where did you buy them?
A.
How
B.
What
C.
What a
D.
What an
【单选题】What did Ken suggest at the end of the conversation?
A.
Buy a new Honda.
B.
Buy insurance for their cars.
C.
Buy a better car.
D.
Take a bus.
【单选题】What did you buy during your last vacation?   I __________ a hat.
A.
buy
B.
buyed
C.
bought
D.
was buy
【单选题】What did the doctor advise when Jerry was badly ill?
A.
Herry should drink more water.
B.
Jerry should rest in bed for a week.
C.
Jerry shouldn't go back to cab work again.
【单选题】--- What a beautiful car! When ________ you ________ it?   --- I ________ it for two years.
A.
did; buy; bought
B.
did; buy; have had
C.
have; bought; have bought
D.
have; bought; have had
【单选题】用LINE(直线)命令画出一个矩形,该矩形中有( )图元实体:
A.
1个
B.
4个
C.
不一定
D.
5个
【单选题】用直线“LINE”命令画出一个矩形,该矩形中有( )图元实体。
A.
1个
B.
4个
C.
不一定
D.
5个
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