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【简答题】
是指与信号无关的一些破坏性因素; 是指与信号有关的一些破坏性因素。
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反馈参考答案：
举一反三
【简答题】She had no liking for aimlessness, and besides thought it vulgar ( 粗鄙的 ). ( )
【单选题】_______ of danger in the street at night, she had to go home, with a friend ______ her.
A.
Warning; following
B.
Having warned; followed
C.
Having been warned; following
D.
Warned; followed
【单选题】Mrs. Robson had lived in the house ______.
A.
since she had sold her flat
B.
for less than a decade C . since she had been born D. for more than ten years
【简答题】史托曼成立了自由软件基金会,它的英文是 。
【单选题】Millie ran back to school because she her magazine in the classroom.
A.
left
B.
forgot
C.
had left
D.
had forgotten
【单选题】She had never been to the Great Wall before. Today she saw it _______ the first time. [ ]
A.
at
B.
for
C.
in
D.
by
【单选题】_____ of the danger in the street at night, she had to go home, with a friend _____ her.
A.
Warned; followed
B.
Warned; following
C.
Having warned; followed
D.
Having warned; following
【单选题】When she got_________the shop, she realized she had________her money at home [ ]
A.
to; left
B.
to; forgot
C.
at; missed
D.
on; given
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