下列除哪项外均属郑声的语言改变（）
A.语言重复
B.声音低弱
C.时断时续
D.语无伦次
E.以上均不是
参考答案：D
根据句意和首字母提示补全单词。
1. Football is as p_____ as basketball in China.
2. Does your family e_____ gifts at Christmas?
3. My grandfather has a long, white b_____ covered his mouth.
4. He is a very kind man. He often helps young children and gives g_____ to the poor.
5. The children think Father Christmas comes down the c_____.
下列选项中,能够激起外部学习动机的因素有()。
A．父母的约束
B．教师的表扬、奖励
C．学习材料的趣味性
D．竞争情境
