7、呼吸中枢的神经元在缺氧时兴奋性升高，因而使呼吸增强，以体现调节作用
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8、二氧化碳在血中浓度变化所引起的呼吸运动变化，主要通过中枢性化学感受器而起作用。
A. 对
B. 错
9、CO2在血液中运输的形式一是形成碳酸氢盐和氨基甲酸血红蛋白，二是和水结合形成碳酸。
A. 对
B. 错
In the story, the narrator was carrying about 80 pieces of gold with him, but his gold was stolen by a thief.
A. 对
B. 错
The Sheik was a Prophet who knew everything happened to the narrator.
A. 对
B. 错
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