问题 填空题

2010年3月22日世界水日之主题--关注水质、抓住机遇、应对挑战,水是一种重要的物质,在实验室和日常生活中有着十分重要的作用.请根据下列提示回答问题:

(1)请列举水在实验室中的一种用途______;

(2)硬水会给生产和生活带来许多不便,生活中可用______的方法降低它的硬度;

(3)农业和园林浇灌植物时,将大水漫灌改为喷灌、滴灌的目的是______;

(4)当你身处在地震灾区时,水资源受到严重污染,必须经过净化处理后才能饮用.下列各项与水的净化过程无关的是______(填标号).

A、吸附;B、消毒;C、电解;D、过滤

答案

(1)水的用途很多,在实验室里,水能洗涤仪器或溶解物质或作反应物等;

(2)在日常生活中将硬水变成软水的方法是加热煮沸或蒸馏;

(3)农业上用大水漫灌会浪费很多水,而且浪费电能,因此可以用喷灌或滴灌代替,使水得到有效地利用;

(4)当我们处在地震灾区时,要积极地采取自救措施,其中将被污染的水净化是重要的一项,净化水的方法很多,可以合理的搭配综合使用.

A、吸附,能吸附有色有异味的物质,有较好的净水作用,故A正确;

B、消毒,能起到杀菌的作用,保护人的健康,这是把天然水变成饮用水必不可少的一步,故B正确;

C、电解,能把水分解成氧气和氢气,不能净化水,故C错;

D、过滤能除去水中难溶性的固体杂质,有较好的净水能力,故D正确.

故答案为:(1)洗涤仪器(或溶解等);

(2)加热煮沸;

(3)节约用水;

(4)C.

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)

A.only too
B.more than
C.not a little
D.no longer

多项选择题