题目

It is a country, in northern Europe. It is home to Santa Claus and the game Angry Birds. And it was recently said to be the world's happiest country. It's Finland（芬兰）!According to this year's United Nations World Happiness Report, Finland topped 156 countries and regions to get the title of the world's happiest country. The ranking（排名）considers six key factors（因素）—income（收入）, freedom, trust, healthy life expectancy（预期健康寿命）, social support, and generosity（慷慨）. What made Finland stand out? Why are its 5. 5 million people so happy?One reas一只狗正在进食，听到枪声后立即停止进食，并兴奋地倒立行走，对此反射活动的叙述不合理的是（ ）A. 获取信息的感受器是耳蜗 B. 其结构基础是反射弧C. 该反射的中枢在大脑皮层 D. 枪声为非条件刺激