摘要:他可能是为了锻炼在跑.He .(B)把划线部分的英文译成汉语.Many years ago, life was much harder than it is today. People didn’t have modern machines. There was no modern medicine, either.Life today has brought new problems. One of the biggest problems is pollution. Water pollution has made our rivers and lakes dirty. It killed our fish and pollute our drinking water.(38)Air pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It’s hard to all the living things in the world.Cars, planes and factories all pollute our air every day, (39) sometimes the polluted air is so thick that it is like a quilt over a city. This kind of quilt is called smog.Many countries are making rules to fight pollution. Factories must now clean their water before it is poured away, they mustn’t blow dirty smoke into the air.We need to do many other things. We can put waste things in the dustbin and not throw it on the ground. We can go to work by bus or with our friends in the same car, (40) the fewer people drive ,the less pollution there will be .38 .39 .40 .四.完形填空:(A)根据短文内容.从A B C D四个选项中选择一个最佳答案.Life is not easy.so I'd like to say “When anything happens.believe in yourself. When I was a young boy.I was 41 shy to talk to anyone.My classmates often 42 me.I was sad but could do nothing.Later. 43 happened.and it changed my life.It was an English speech contest.My English teacher asked me to 44 it.What a terrible idea! It meant I had to speak 45 all the teachers and students of the school!“Come on.boy.Believe in yourself.You are sure to 46 . Then my English teacher and I talked about many different topics.At last.we 47 the topic “Believe in yourself .I tried my best to remember all the speech and practiced it over 100 48 .With my English teacher's great love.I did 49 in the contest.I could hardly believe my 50 when the news came that I had won the first place.I heard the cheer 51 the teachers and students.Those classmates 52 once looked down on me.now all said “Congratulations! 53 me.My English teacher hugged me and cried excitedly. 54 then.everything has changed for me.When I do anything.I try to tell 55 to be sure and I will find myself.This is true not only for a person but also for a country.

网址:http://m.1010jiajiao.com/timu_id_874340[举报]

现有某金属硝酸盐化学式为M(NO32,为了探究其热分解产物,某化学小组开展探究性学习:
金属活泼性不同,其硝酸盐分解产物不同。如:2KNO32KNO2+O2
2Cu(NO322CuO+4NO2↑+O2↑,2AgNO32Ag+2NO2↑+O2
猜想1:M(NO32M(NO22+O2
猜想2:2M(NO322MO+4NO2↑+O2
猜想3:(此处不写)               
为了探究上述猜想,设计如下实验装置:

实验步骤:①连接仪器;②检查装置气密性;③取一定量的样品装于大试管中,并重新连接好   仪器;④加热;⑤……
(1)写出猜想3的化学方程式:                                 
(2)测定气体体积应选择          (填A或B);
(3)实验收集到一定量气体,为了检验收集到的气体的成分,其操作方法是         
(4)在实验后的水里加入适量碳酸氢钠粉末,溶液中产生大量气体,说明       正确(填:猜想l、猜想2或猜想3);
(5)该小组测得一组数据:实验前样品质量为Wg,收集到气体体积为VL(已折算成标准状况),则M的相对原子质量为____;
(6)已知4Fe(NO322Fe2O3+8NO2↑+O2↑,现在对KNO3、Cu(NO32、Fe(NO3的混合粉末充分加热后未收集到任何气体,则KNO3、Cu(NO32、Fe(NO32的物质的量之比可能是                                 (   )
A.1:2:2           B.2:1:4                   C.1:2:3                  D.3:8:6
查看习题详情和答案>>

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网