问题
单项选择题
在B 类网络中，可以分配的主机地址是多少？ （ ）
A．1022
B．4094
C．32766
D．65534
答案
参考答案：D
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在B 类网络中，可以分配的主机地址是多少？ （ ）
A．1022
B．4094
C．32766
D．65534
参考答案：D
阅读下面短文，掌握其大意，然后从36至50各题所给的四个选项（A、B、C、D）中,选出最佳选项，并在答题卡上将该项涂黑。 People who are cheerful and relaxed are less likely to suffer from colds．It's 36 that being full of vim（活力） and vigor（精力） helps the body 37 illnesses, say the researchers from Carnegie Mellon University（CMU） in Pittsburgh． "We need to take more seriously the possibility that a 38 emotional style is a fighter player in disease risk," says psychologist Sheldon Cohen, the study's lead researcher． In a previous study, Cohen and his colleagues found that people who 39 to be cheerful and lively were 40 likely to develop sniffles, coughs, and other cold symptoms （症状）． Those findings were interesting, but they didn't prove that a person's 41 affects whether he or she gets sick． 42 it was still possible that a person's underlying personality is 43 matters． 44 suggests, for instance, that certain people are naturally more likely to be outgoing（外向的）and 45 , with high self-respect and a sense of 46 over life．This would mean that who we are, not how we feel, finally decides our 47 of catching colds． To figure out which mattered more （personality or 48 ）, the CMU team 49 193 healthy adults．The researchers talked to each person over the phone every evening for 2 weeks．They told the researchers about the positive and negative 50 they had experienced that day． The results showed that everyone in the study was 51 likely to get infected．Their symptoms（征兆）, however, 52 depending on the types of emotions that they had reported over the 53 2 weeks． Scientists 54 about whether negative emotions or positive emotions have a stronger 55 on how healthy we are．For now, it can't hurt to look on the bright side more often than not!
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