[多项选择]使用访问控制列表可带来的好处是( )。
A. 保证合法主机进行访问，拒绝某些不希望的访问
B. 通过配置访问控制列表，可限制网络流量，进行通信流量过滤
C. 实现企业私有网的用户都可访问Internet
D. 管理员可根据网络时间情况实现有差别的服务
E. 提高网络安全性

On his fifty-fifth birthday the president decided to (1) some prisoners of the (2) age as a gesture of good will Not too many, but one, say, from each of the twenty of thirty (3) prisons in the small state. They would have to be carefully selected (4) not to give trouble once they were out. Men perhaps had been so (5) in prison that they had ceased to have and real contact with the outside world. None of them was to be told a (6) of his (7) liberty. Marlo was therefore (8) when he was called to the Governor’s office one morning and told he was to be set (9) next day. He had spent almost three quarters of. his life in (10) working out a life sentence (11) stabbing a policeman to death. He was a dull-witted man with no relations (12) and no friends except his prison mates.
The following morning was clear and bright. Marlo (13) no opportunity to say goodbye to (14) but a g
A. a little
B. a few
C. some
D. anyway

Clinical depression is a serious ailment, but almost everyone gets mildly depressed from time to time. Randolph Nesse, a psychologist and researcher in evolutionary medicine at the University of Michigan, likens the relationship between mild and clinical depression to the one between normal and chronic pain. (46)He sees both pain and low mood as warning mechanisms and thinks that, just as understanding chronic pain means first understanding normal pain, so understanding clinical depression means understanding mild depression.
Dr. Nesse’s hypothesis is that, as pain stops you doing damaging physical things, so low mood stops you doing damaging mental ones — in particular, pursuing unreachable goals. Pursuing such goals is a waste of energy and resources. (47)Therefore, he argues, there is likely to be an evolved mechanism that identifies certain goals as unattainable and inhibits their pursuit — and he believes that low mood is at least part of