In most countries the income of the rich is increasing_____those at the bottom（）
A. faced with
B. in the case of
C. at the cost of
D. thanks to
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Tom has to work day and night since he became a team leader. Now, his hard work _____ on his stomach（）
A. has taken its part
B. has taken its effort
C. has taken its toll
D. has taken its role
The enemy,__, soon surrendered（）
A. bringing to a halt
B. catching off guard
C. brought to a halt
D. caught off guard
Modern control theory can deal with（）
A. Multi-input multi-output systems
B. Linear systems
C. Nonlinear systems
D. Time-varying systems
Which is wrong for describing linear transform matrix P（）
A. For linear time-invariant system, nonsingular matrix P won’t change system eigenvalues
B. For linear time-invariant system, nonsingular matrix P won’t change system transfer function
C. For linear time-invariant system, nonsingular matrix P won’t change system state space model
D. Nonsingular matrix P is consisting of linearly independent vectors
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