问题
单项选择题
According to the author, swans in captivity are ______.
A．happy unless their wings have been cut
B．happy most of the time, but unhappy sometimes
C．unhappy most of the time
D．only happy when they are bringing up families
答案
参考答案：B
解析：[分析] 推断题型。 第二段第一句话说...swans generally seem happy，所以，天鹅大部分时间都是很幸福的。