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【单选题】
在工作区1中已打开数据库CGE．DBF，则在工作区2再次打开操作是( )。A.
USE IN2 AGAIN
B.
USE CGE IN2AGAIN
C.
USE CGE IN 2
D.
非法操作
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举一反三
【简答题】There ______(be)fresh air here. Let's go.
【单选题】There are too many people here. Let's go upstairs where we can be ______. [ ]
A.
more private a bit
B.
a bit more private C . private a bit more D. private more a bit
【单选题】—Let's cross the street here. —________We'll never make it in one piece! Let's cross at traffic lights.
A.
Go ahead.
B.
Don't mention it.
C.
It's up to you.
D.
You must be kidding.
【简答题】用所给单词的正确形式填空。 1. What are (this)? 2. Let's (have) a big ball. 3. Here (be) the answers. 4. What (do) she speak in this country? 5. Where (be) they from? 6. Australia (have) beautiful beaches.
【单选题】—Will Mr. Smith be here soon? —I can't tell, let's go and ________ when the train arrives. [ ]
A.
find out
B.
look out
C.
find
D.
look
【多选题】主动响是指基于一个检测到的入侵所采取的措施。对于主动响应来说,其选择的措施可以归入的类别有()?
A.
针对入侵者采取措施
B.
修正系统
C.
收集更详细的信息
D.
入侵追踪
【单选题】A: Let's stop here. We've driven enough for a whole day. B: ______
A.
OK. Why don't you check the map to see where we are.
B.
OK, but we need to drive a little farther.
C.
All right, but I don't think we have trouble finding a motel.
D.
All right. It might be hard to find a good place to stay here.
【多选题】主动响应，是指基于一个检测到的入侵所采取的措施。对于主动响应来说，其选择的措施可以归入的类别有( )
A.
针对入侵者采取措施
B.
修正系统
C.
收集更详细的信息
D.
入侵追踪
【简答题】设随机变量 的概率密度函数为 , 则随机变量 的概率密度函数为 ,其中 _______, _______, _______
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