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【单选题】
以下Windows命令中，可以用于测试网络通断的命令是（）A.
tracert
B.
arp -a
C.
ping
D.
telnet
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反馈参考答案：
举一反三
【简答题】Tom ________ better than to ask Dick for help. A) shall know B) shouldn’t know C) has known D) should have known
【单选题】What does the author mean by saying 'they know better now'?
A.
They know more about the causes of the drought.
B.
They have a better understanding of the drought in Africa.
C.
They have realized that the drought in Europe is the most serious one.
D.
They have realized that droughts hit not only Africa but also Europe.
【单选题】下列不是分支结构的语句是
A.
If ... Then ... EndIf
B.
While ... Wend
C.
If ... Then ... Else ... EndIf
D.
Select ... Case ... End Select
【简答题】点B(-1,-1,1)在第______卦限
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