问题 填空题

X、Y、Z三种气体都能对大气造成污染,在工业上都可以用碱液吸收。已知X是化石燃料燃烧产物之一,是形成酸雨的主要物质;Y是一种单质,它的水溶液具有漂白作用;Z是硝酸工业和汽车尾气中的有害物质之一,能与水反应。请写出下列物质反应的化学方程式。

⑴ X在一定条件下与氧气反应__                      ______­­­­­­

⑵ Y与氢氧化钠溶液的反应_____                   ________

⑶ Z与水的反应___                         _______________

答案

⑴ 2SO2 + O2 2SO3

⑵ Cl2 + 2NaOH ="=" NaCl + NaClO + H2O;

⑶ 3NO2 + H2O ="=" 2HNO3 + NO 。

X是化石燃料燃烧产物之一,是形成酸雨的主要物质知:X为SO2。Y是一种单质,它的水溶液具有漂白作用知:Y为Cl2。Z是硝酸工业和汽车尾气中的有害物质之一,能与水反应,知Z为NO2。⑴2SO2 + O2 2SO3;⑵ Cl2 + 2NaOH ="=" NaCl + NaClO + H2O;

⑶ 3NO2 + H2O ="=" 2HNO3 + NO 。

填空题
单项选择题

After winning a big game, athletes are often asked how they feel. Usually athletes say how (1) it is to win this big game. On the contrary, the fact is that losing a big game, or in my case, all the games, can be even harder.

From the spectators’ point of view, last year’s basketball (2) for my high school team was nothing (3) of an embarrassment. And (4) 0 and 20 is certainly nothing to be proud of, that season had a bigger impact on me than any other. As a team captain, I knew it probably wouldn’t be the (5) year, but did I ever think we would lose every game Of course not. Since six of our top players had graduated, it was clear that we were a (n) (6) team who would struggle. The struggle began earlier than expected, (7) , as our team center was suspended (禁赛) for the season, and two key members decided to (8) for some reason. At this point, dropping out probably passed through every player’s mind, but in the end, we all stuck if out, (9) to work still harder.

Then there came a time when even our (10) and given up on us. Personally, I felt like it was (11) worthwhile giving my all. I thought, if even the coach doesn’t believe in us, why should I But just as my hope began to (12) , a teammate called a meeting. He said," Nobody thinks we are going to win, but, as teammates and friends, we (13) it to each other to go all out every game. "

It was that moment that (14) me how to be a leader. It hit me that I certainly didn’t (15) the role. As a leader you can never quit (16) the team who looks up to you. It is one (17) to be named captain, feel great and go through the motions, but it is quite another to be a real captain and make sure everyone realizes their full (18) all the time.

I am sure it is great to go through without losing and bringing home awards. But in all honesty, I (19) the fact that my team lost every game last year. It may not help me to become a better basketball player, but it already has made me a better leader, and (20)

4().

A.as

B.while

C.since

D.now that