开发旅游资源必须考虑资源的效益功能,即()、()、()
参考答案:经济效益,社会效益,生态环境效益
在下列各句的空白处填入一个适当的词,每空一词,使句子意思完整,语法正确。
1. Thank you very much for ______ me to your house for dinner.
2. I can't go to the movie with you tonight. I have to ______ my dog.
3. Tom started learning to play the piano at the _______ of 12.
4. My sister can speak two foreign _______ French and Japanese.
5. She _______ the first prize in the Super Voice Girls Competition in 2009.
婴幼儿每次排便的时间应该为()左右。
A.5分钟
C.10分钟
B.15分钟
D.20分钟