如果养鱼缸长时间不换水,缸的内壁就会长出绿膜,水会变成绿色。这是什么原因?
养鱼缸长期不换水,鱼的排泄物和粪便使得鱼缸中养料增加,藻类植物得以大量繁殖,因此鱼缸中的水回逐渐变绿。
电视已经走进了千家万户,是我们生活的重要组成部分。每个人都有自己最喜爱的电视节目。下面是五个人的描述,请根据他们的描述从A-F中为他们选择合适的电视节目。____ I am 73 years old. I often watch TV in my free time. Of all the programs, I like the news best. Through the TV, I can learn what is happening in our country and in the world. At seven every evening , I always sit in front of the TV.____ I am a grandma. I like Chinese traditional opera. From Monday to Thursday, I usually turn on the TV at half past seven. The programs from CCTV7 are my best.____ I am a basketball fan. I like playing basketball very much. But I am too busy. So I have to watch it on the TV. Every night, I watch the match till midnight.I am crazy about it , especially NBA____ I am a housewife. I do the housework all day, I’d like to watch TV at night. I prefer to see soap operas like ‘palace”, “meteoric garden” and so on.Because they can make me feel relaxed.____ I am the only son in the family. I am in Grade Five. I like cartoons best. I often watch cartoons on the TV after doing the homework. A B C D E F.
读图,回答以下问题。
①y=2.347x﹣6.423,且r=﹣0.9284;
②y=﹣3.476x+5.648,且r=﹣0.9533;
③y=5.437x+8.493,且r=0.9830;
④y=﹣4.326x﹣4.578,且r=0.8997.
其中一定不正确的结论的序号是____.
My elder brother my wet sports shoes and made me sit by the fire.