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【单选题】
对于MCS-51单片机系统来说，其所使用的电源一般为（ ）A.
直流5V
B.
直流3.3V
C.
直流12V
D.
交流5V
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反馈参考答案：
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】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】Any student who _________ his homework is unlikely to pass the examination.
A.
reduces
B.
offends
C.
practices
D.
neglects
【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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