2016年3月25日，中共中央政治局会议审议通过《              发展规划纲要》，明确其战略定位必须坚持生态优先、绿色发展，共抓大保护，不搞大开发。（   ）

（CaO₂）是一种化学增氧剂，其反应原理是2CaO₂+2H₂O═2Ca（OH）₂+O₂↑．小明将2g含过氧化钙72%的固体放入盛有100L水的鱼缸中，请你通过计算分析，当氧气完全释放后，鱼缸中水的溶氧量是否符合最低要求？（假设产生的氧气完全溶于水，其他因素忽略不计）

下列结论：

⑴ac＜0；

⑵当x＞1时，y的值随x值的增大而减小．

⑶3是方程ax²+（b﹣1）x+c=0的一个根；

⑷当﹣1＜x＜3时，ax²+（b﹣1）x+c＞0．

其中正确的个数为（   ）

    My mother is a teacher. On weekdays, she gives lessons at school and on Saturdays she works in clubs. On Sundays, she is still busy.

On Sunday morning, mum gets up at six. She cooks breakfast for us first. And then it's time for cleaning. After that, she has breakfast with father and me. At 9, she goes to buy food for lunch in the supermarket. She can have a short rest after lunch. In the afternoon, mum doesn't go out. She helps me with my lessons. She does some reading, too.

    Mother watches TV at about 7 when she finishes (完成) the housework. But at that time she is always tired and falls asleep (睡着) in the sofa sometimes.

对下面句子中加线词的理解有错误的是(      )。