问题
单项选择题 A1型题
普萘洛尔阻断突触前膜上的β受体，可引起（）
A.去甲肾上腺素释放减少
B.去甲肾上腺素释放增加
C.去甲肾上腺素释放无变化
D.心率增加
E.外周血管收缩
答案
参考答案：A
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普萘洛尔阻断突触前膜上的β受体，可引起（）
A.去甲肾上腺素释放减少
B.去甲肾上腺素释放增加
C.去甲肾上腺素释放无变化
D.心率增加
E.外周血管收缩
参考答案：A
Vincent van Gogh was not always an artist. In fact, he wanted to be a(n) __21 and was even sent to the Belgian __22 community of Borinage. He discovered that the miners there __23 deplorable(悲惨的) working conditions and poverty-level wages. Their families __24__ simply to survive. He felt concerned that the small amount of money he received from the church __25 him a moderate life-style, which, __26 , seemed to him unfair. One cold February evening, while he watched the miners trudging(步履艰难)home, he __27 an old man staggering(蹒跚)toward him across the fields, __28 in a burlap sack for warmth. Van Gogh laid his own clothing out on the bed, __29 enough for one change, and decided to give__30 away. He gave the old man a suit of clothes and gave his overcoat to a pregnant woman whose __31 had been killed in a cave-in. He lived on starvation rations and spent his money on __32 for the miners. When children in one family had fever, though __33 himself, he packed up his bed and took it to them. A (an) __34 family in the community offered him free room and board. Van Gogh __35__ the offer, stating that it was the final temptation he must reject if he was to __36 serve his community of poor miners. He believed that if he wanted them to __37 him, he must become one of them. And if they were to learn of love through him, he must love them enough to __38 with them. He was aware of the wide chasm(鸿沟)between words and actions. He knew that our lives always __39 louder and clearer than words. Others are “ __40 ” carefully to your actions. What are you saying to them?
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