They were walking in the forest when they heard a __________ roar which made their blood freeze.
A. terrifying
B. terrific
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Obviously they were getting nowhere with the meeting, so he decided to ______ from making a final decision that afternoon.
A. desist
B. resist
The president arrived, ________ by twelve soldiers.
A. raided
B. escorted
He _______ to the peak of sporting achievement.
A. ascended
B. descended
根据输入信号和输出信号的个数，系统有单输入单输出系统和多输入多输出系统。
A. 对
B. 错
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