试题要求：
When a horse's ears are down, we know that it is_____.
试题解析：
答案：B
解析：
细节理解题。定位到文中第三段"When a horse lets its ears down, it's feeling safe and relaxed."该句可知，当马的耳朵向下，此时它感觉安全且放松。故选B。
考点：阅读选择,2018.10
When a horse's ears are down, we know that it is_____.
细节理解题。定位到文中第三段"When a horse lets its ears down, it's feeling safe and relaxed."该句可知，当马的耳朵向下，此时它感觉安全且放松。故选B。