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【多选题】
下列关于计算机病毒特性描述正确的是()A.
任何计算机病毒只要侵入系统，产生不同程度的影响
B.
计算机病毒通常附着在程序或磁盘较隐蔽的地方
C.
大部分病毒感染系统后一般不会马上发作，可长期隐藏在系统中
D.
计算机病毒可通过各种渠道从已被感染的计算机扩散到未被感染的计算机
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举一反三
【单选题】The writer believed he had passed the exam ______.
A.
as the result of his hard work
B.
as the result of his professor's showing mercy to him
C.
mainly due to his tireless revision in the night before the exam
D.
out of his expectation
【单选题】The new machine, as is reported in the local newspaper, will work twice as fast, _____ greatly reducing costs.
A.
thus
B.
anyhow
C.
yet
D.
even
【单选题】The writer and his friend______.
A.
had never been to that bar before
B.
did not know if they had come to the right place
C.
asked somebody the name of the bar
D.
had little difficulty in finding the bar
【单选题】When the writer first came to the capital______.
A.
he had been very reluctant to leave his mother
B.
his mother had not wanted him to leave home
C.
he had made no preparations for his journey south
D.
he had sent his possessions on ahead in a trunk
【单选题】That day the writer found ______.
A.
he had lost his wallet
B.
he had left his wallet at home
C.
his wallet was stolen by a thief
D.
his wallet was lying under the table
【单选题】For some time now, world leaders _______ out the necessity for agreement on arms reduction.
A.
had been pointing
B.
have been pointing
C.
were pointing
D.
pointed
【单选题】According to the latest research, getting enough sleep is _____ to maintaining good health and reducing stress.
A.
essential
B.
promising
C.
special
D.
sensible
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