⑸ ，不亦乐乎？（《论语·学而》）
对于一个处于平衡状态的生态系统来说，下列哪种现象不存在( )
III读理解． (20分)
我从未想到类似的事情
7．My friend with me___________ going to Sanya ___________vacation next week．
5．—How many people will come to Shanghai next month
12． ________mothers both work in the same hospital．
— Can you catch what the teacher said in the English class
下列说法正确的是
下列化学用语既能表示一种元素，又能表示一个原子，还能表示一种物质的是
24． Peter is tired of study，maybe because he _______ ．
② 枯藤老树昏鸦，小桥流水人家，________________ 。（《天净沙 秋思》）
All the students in Class 5 will climb the mountain if it _______ rain tomorrow.
2． —What do you do_________ Friday evening
2． — ________ I fill in the check-in form. right now，sir