问题 问答题

2月16日生效的“京都议定书”是为减少二氧化碳排放而制定的国际公约.某研究小组为监测空气中二氧化碳含量,进行了如下实验:用50mL注射器吸取红色含酚酞的稀氨水(氨水是一种碱,具有碱的性质)10ml并密封,然后在下列地点分别抽取空气到50ml刻度处,堵住注射器吸入口,振荡后,将注射器吸入口向上,小心将余气排出.重复上述操作若干次(n),直至注射器内溶液的红色褪去.记录数据如下表:

取样地点平均抽气次数(n)气体CO2的含量(体积)
空旷的操场上300.030%
在刚下课的教室里29①______
汽车流量较大的车站旁15②______
(1)已知抽气次数与CO2的含量(体积)成反比,请计算并填写上表的①②两个空格.

(2)这个实验中使红色褪去的化学原理是:______.

(3)请提出-个能降低空气中二氧化碳含量,防止温室效应的可行措施:______.

答案

(1)∵抽气次数与CO2的含量成反比

∴教室内CO2的含量=0.030%÷

2
3
=0.045%;

车站旁CO2的含量=0.030%÷

1
2
=0.060%

(2)这个实验中使红色褪去的化学原理是:二氨水是一种碱,二氧化碳与碱反应后溶液的碱性减弱,至接近中性时,使酚酞褪色;

(3)防止温室效应可以从以下两个方面入手:①减少二氧化碳排放类:使用H2等新能源;控制汽车增长等;②增加二氧化碳消耗类:植树造林;设法将空气中的二氧化碳固定等.

故答案是:(1)①O.045%;②0.060%.

          (2)二氧化碳与碱反应后溶液的碱性减弱,至接近中性时,使酚酞褪色

          (3)使用H2等新能源;控制汽车增长;植树造林;设法将空气中的二氧化碳固定等.

完形填空
There lived a young man in a village. He was born in a      family. His parents had a lot of farms and got much money . He was in school for only four years, but he thought he knew all.       the villagers called him Mr. Know-All. And he told his servants not to tell him the results(结果) directly (直接地). The servants . were afraid of  him and had to listen to him.
One day Mr. Know-All went to     his friend who lived in a town. He stayed there for nearly a week. Suddenly one of his servants came and called out, “     , sir!”
“What happened?”
“Your cat has died!”
“What’s there to be surprised at (吃惊)?” said the young man. “Throw it to the river. By the way, of what illness did it die?”
“It     much meat of the horse and died.”
“What? Has my horse died, too? And what illness did it die of, then?”
“It pulled(拉) the carried (马车) to the hospital,” said the servant. “ We made it     as fast as possible. When we reached the hospital, it was so tired that it couldn’t     up any longer and died.”
“Wait a minute,” said Mr Know-All. “What did you go to the hospital for?”
“To     your mother there.”
“What’s the matter with my mother?”
“She     down stairs and hurt her head. We sent her to the hospital, but it was too late. The doctors operated on(动手术)her at once, they tried their best to save her, but she died!”
Mr Know-All became angry and shouted, “Why didn’t you tell me about it     ?”
“You never let us tell you the results directly, sir.”
小题1:
A.worker’sB.teacher’sC.farmer’sD.soldier’s
小题2:
A.ButB.ThenC.OrD.So
小题3:
A.look afterB.hurtC.look forD.visit
小题4:
A.Good newsB.Bad newsC.Good morningD.Good afternoon
小题5:
A.ateB.sawC.touchedD.cut
小题6:
A.runB.walkC.jumpD.fly
小题7:
A.sitB.lieC.sleepD.stand
小题8:
A.postB.bringC.takeD.put
小题9:
A.wentB.livedC.stayedD.fell
小题10:
A.earlyB.earlierC.earliestD.the earliest
单项选择题