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问题 单项选择题

静脉注射去甲肾上腺素后出现血压升高，心率减慢。心率减慢出现的主要原因是（）

A.去甲肾上腺素对心脏的抑制作用

B.去甲肾上腺素对血管的抑制作用

C.减压反射活动减弱

D.减压反射活动增强

E.大脑皮质心血管活动中枢活动减弱

答案

参考答案：D

选择题

伴随着城市化进程，每年有1500万农村人口转为城市人口。人们担忧通货膨胀，选择通过买房实现保值增值，使土地价格猛增，导致房价不断上涨。这说明商品价格主要是由 [ ]

A、商品质量决定

B、居民的购买力决定

C、消费心理决定

D、价值决定，并受供求关系影响
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改错题

My grandmother is a village woman. She is already in her seventy. Although she received little school education, but she is aware that knowledge is of great important lo young people. When my father was young, my grandmother took care him so that my father could cast more time on his studies. Now, she often encouraged me to study hard. This summer she was bad ill in bed. When I visited her during the summer holiday,I found her silting in bed, made new shoes for me!

I was so deeply moving that tears came to my eyes. My grandmother is so a kind and hardworking woman. I’ ll respect and love her forever.
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