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【单选题】
On what conditions did the kidnapper promise the safe return of Rastus?A.
His name was not to be revealed and he wanted a ransom of￡1,000.
B.
Mrs. Ramsay was not to inform the police and had to pay￡1,000.
C.
Mrs. Ramsay had to leave her flat until the box with the money had gone.
D.
Mrs. Ramsay was to withdraw￡1,000 from her bank and follow his instructions.
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举一反三
【多选题】下面论述正确的是（ ）
A.
对于线性定常系统，原点平衡状态是其唯一的平衡状态
B.
如果线性系统是渐近稳定的，必然是大范围渐近稳定的
C.
如果非线性定常系统是渐近稳定的，必然是一致渐近稳定的
D.
对单输入单输出线性定常系统，矩阵 A 的特征值与该系统的传递函数极点相同
【单选题】A good teacher is one willing to try different methods to ________ the demands of the students of different learning styles. [ ]
A.
know
B.
see
C.
meet
D.
feel
【单选题】“ You have upwards of 300 students.” means __.( )
A.
You have over300 students.
B.
You have up to 300 students.
C.
You have less than 300 students.
D.
You have 300 students in total.
【单选题】A number of students ____ seen the film. That is，the number of the students who have seen the film____ large.
A.
have; is
B.
has；are
C.
has; is
D.
have； is
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