问题
单项选择题
有关颈动脉窦压力感受器反射的叙述正确的是（）
A.在血压升高时才发挥作用，在血压平稳时不发挥作用
B.平时经常起作用
C.在血压升高时才发挥作用
D.在血压降低时才发挥作用
E.在血压波动时起作用，对稳定性血压上升不起作用
答案
参考答案：E
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有关颈动脉窦压力感受器反射的叙述正确的是（）
A.在血压升高时才发挥作用，在血压平稳时不发挥作用
B.平时经常起作用
C.在血压升高时才发挥作用
D.在血压降低时才发挥作用
E.在血压波动时起作用，对稳定性血压上升不起作用
参考答案：E
Sneakers are a kind of shoes worn by many people all over the world. , no one really knows where the word “sneaker” came from. Some say it came from the old English verb “sneak”, which means to move silently and quickly. The only thing we are is that when you put on a pair of sneakers, you feel light-hearted, light-footed and ready to play.  Sneakers of some kind are used by those who play tennis, basketball, and other sports. New design has been made for people who run slowly. In fact American children of ages would much rather play in sneakers than anything else. New York City once held a poetry competition for children. The subject was only “sneaker”. One prize winner called poem “The Sneaker and the World Peace”. “When everyone is wearing sneakers,” she said, “it will be impossible to .” American school children can be seen every day sneakers of all colors. They put them on in the morning and take them off at bedtime. Sneakers are washed. Some children think the older and dirtier they are, the loveable they are. When their sneakers wear out, children hate to throw them off. How do you explain the closeness between and sneakers? Perhaps another young winner in the New York Poetry Contest said it best. “A shoe is just a shoe,” he said. “But a sneaker is a friend.”
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