问题
                    
填入下面一段文字横线处的语句,最恰当的一句是辣,我们都不陌生,很多人无辣不欢甚至吃辣上瘾,这是因为辣椒素等辣味物质刺激舌头、口腔的神经末梢时,会在大脑中形成类似灼烧的感觉,机体就反射性地出现心跳加速、唾液及汗液分泌增多等现象,___________,内啡肽又促进多巴胺的分泌,多巴胺能在短时间内令人高度兴奋,带来“辣椒素快感”,慢慢地我们吃辣就上瘾了。
                            A:大脑在这些兴奋性的刺激下把内啡肽释放出来
B:内啡肽因这些兴奋性的刺激而被大脑释放出来
C:这些兴奋性的刺激使大脑释放出内啡肽
D:这些兴奋性的刺激使大脑把内啡肽释放出来
                        
                        B:内啡肽因这些兴奋性的刺激而被大脑释放出来
C:这些兴奋性的刺激使大脑释放出内啡肽
D:这些兴奋性的刺激使大脑把内啡肽释放出来
正确答案是:
                         
                        
                        
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