在25℃时将pH=11 的NaOH溶液与pH=3的CH3COOH溶液等体积混合后

题型:不定项选择题

问题:

在25℃时将pH=11 的NaOH溶液与pH=3的CH3COOH溶液等体积混合后,下列关系式中正确的是[ ]

A.c(Na+)=c(CH3COO-)+c(CH3COOH)

B.c(H+)+C(Na+)=c(CH3COO-)+c(OH-)

C.c(Na+)>c (CH3COO-)>c(OH-)>c(H+)

D.c(CH3COO-)>c(Na+)>c(H+)>c(OH-)

考点:粒子浓度大小的比较
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北京奥组委发布的北京2008年奥运会奖牌式样,有对它所作的一些介绍。下面是介绍奖牌的句子,排序合理的一项是(   )(2分)

①奖牌背面镶嵌玉璧

②即站立的胜利女神和希腊潘纳辛纳科竞技场全景

③奖牌正面使用国际奥委会统一规定的图案

④奖牌的挂钩由中国传统玉双龙蒲纹璜演变而成

⑤玉璧正中的金属图形上镌刻着北京奥运会的会徽

A.①②④③⑤

B.③⑤①④②

C.①⑤④③②

D.③②①⑤④

题型:不定项选择题

关于阿根廷潘帕斯草原大牧场放牧业的叙述,正确的是(    )

A.气候干旱,植被稀少

B.牧羊占重要地位

C.大牧场土地租金低廉

D.具有距海港近的区位优势

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有效调控径流和水流量季节变化,解决水资源分配不均的方法是______、而解决水资源地区分布不均的有效办法是______.

题型:不定项选择题

A long time ago, in an Italian city, the people there built a tower which was admired by everyone passing through. A little further down the road, in a neighboring city, they had built a tower of similar beauty. The two towers were equally well known. The people of the second city, envious (妒忌的) and filled with pride, planned to destroy the neighboring tower so it wouldn’t take attention away from their own. One night, they came to the tower and began to quietly undermine its foundations(地基).

The next morning, the tower was leaning(倾斜) slightly ,but nobody noticed. The same happened for the following few days, until a little girl who was passing by pointed up at the tower and said: “ I think the tower is going to fall down.” And everyone around looked closely, and could see that she was right .Nervousness spread through the city. And they tried many methods to try to straighten the tower, but nothing seemed to work. That was, until one day when the same little girl was walking up again, and she put her arm on the side of the tower to rest. She felt the tower shaking slightly. When she took her hand off it, the movement stopped. And when she put it back on again, the same thing happened. The girl spent a while doing this, until she was completely certain of what she had discovered: “ The tower is ticklish ( 怕痒的) !” She ran to get some plants, and she planted them right next to the tower. Now if the tower leant over any further it would be tickled by the leaves of those plants. Being a ticklish tower, it would then return to where it had been. In this way, the girl managed to make sure that the tower didn’t fall down, but still kept it leaning a little.

The fact that it was leaning made it even more famous, and this taught a fine lesson to the envious people of the neighboring city.

小题1:Why did the people of the second city plan to destroy the neighboring tower?

A.Because the tower blocked the way of their tourists.

B.Because the tower had the same building style as theirs.

C.Because they hoped that the tower could lean slightly.

D.Because they hoped that visitors just liked their own tower.小题2:The underlined word“undermine”(in Paragraph1)probably mean “_________”.

A.test

B.raise

C.damage

D.strengthen小题3:When local people heard the news that their tower was going to fall down, they were _________.

A.very anxious

B.very happy

C.very ashamed of themselves

D.angry at the people in the neighboring city小题4:What lesson can we learn from the practice of the envious people in the neighboring city?

A.All that ends well is well.

B.Every dog has his day.

C.A bad beginning makes a bad ending.

D.A friend is never known till a man has need.

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洪江水情测报系统采用的水位计是()型。

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