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【单选题】
网络地址为192.168.22.0，网络掩码为255.255.255.252，其子网中第1个地址和最后1个地址应为哪个？（ ）A.
192.168.22.1和192.168.22.2
B.
192.168.22.2和192.168.22.3
C.
192.168.22.253和192.168.22.254
D.
192.168.22.254和192.168.22.255
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举一反三
【单选题】NASA's working definition for 'life' is: "Life is a self-sustaining system capable of ______________ evolution."
A.
rapid
B.
Darwinian
C.
slow
D.
radical
【单选题】When did NASA．staff working on a successor to the shuttle? A．One year before the Columbia disaster.
B.
One year after the Columbia disaster.
C.
Immediately after the Columbia disaster.
D.
Years before the Columbia disaster.
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