单选题：Many a player who had been highly thought of has ________ fr

题目内容：

Many a player who had been highly thought of has ________ from the tennis scene. A．disposed
B．disappeared
C．discouraged
D．discarded

参考答案：

答案解析：

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（题共用备选答案）A．刺激外周化学感受器B．刺激中枢化学感受器C．直接作用于呼吸中枢D．刺激肺牵张感受器E．刺激脑桥呼吸调整中枢动脉血中C02分压升高引起呼吸加

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