问题
单项选择题
副交感神经节前纤维释放的递质是（）
A．去甲肾上腺素
B．乙酰胆碱
C．肾上腺素
D．多巴胺
E．5-羟色胺
答案
参考答案：B
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副交感神经节前纤维释放的递质是（）
A．去甲肾上腺素
B．乙酰胆碱
C．肾上腺素
D．多巴胺
E．5-羟色胺
参考答案：B
A farmer had some young dogs to sell. He made an advertisement and began to nail (钉) _36 into the wall. As he was knocking the last one into the wall, he _37 a pull on his coat. He looked 38 and found a little boy. “Mister,” he said, “I want to _39 one of your dogs.” “Well,” said the farmer, as he 40 the sweat (汗水) off his neck, “these dogs come from__41 parents and cost plenty of money.” The boy 42 _his head for a moment. Reaching deep into his pocket, he pulled out a handful of 43 and handed them to the farmer. “I’ve got thirty-nine cents. Is that 44 to take a look?” “Sure,” said the farmer. Then he let out(发出) a 45 . “Here, Dolly!” he called. Dolly ran out from the doghouse, __46 by four little dogs. The boy’s eyes danced __47_ . As the dogs ran to the fence (篱笆), the boy noticed something else moving _48 inside the doghouse. Then another little dog 49 . This one was even smaller, walking with 50 to the others, doing its best to catch up with them. “I 51 that one,” the boy said, pointing to the smallest and 52 developed dog. The farmer said, “Son, you don’t want that dog, 53 he will never be able to run and play with you.” Hearing that, the boy stepped back, and began rolling up(卷起) one leg of his 54 . A steel brace (铁的支撑板) appeared running down his leg connecting itself with a 55 made shoe. He said to the farmer, “You see, I don’t run too well myself, and he will need someone who understands.”
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