题目内容：
Contagious yawning wouldn't exist unless __[A] the ability of yawning is taught
[B] the abilitv to emnathize is learned
[C] empathy is never developed
[D] vawning is controlled well
参考答案：
答案解析：
填空题：Contagious yawning wouldn't exist unless __[A] the ability o
- 题目分类：英语四级
- 题目类型：填空题
- 查看权限：VIP
[A] the ability of yawning is taught
[B] the abilitv to emnathize is learned
[C] empathy is never developed
[D] vawning is controlled well