问题 选择题

(2011年湖南株洲,第2题) 下列各图所示只发生物理变化的是(  )

答案

答案:C

考点:

专题:化学与能源;物质的变化与性质;金属与金属材料.

分析:观察图示,分析图中的变化,根据变化的特征分析.如果有新物质生成,则属于化学变化;没有新物质生成,则是物理变化.

解答:解:A、甲烷的燃烧的过程中甲烷与氧气反应,有新物质二氧化碳和水生成,属于化学变化.故A选项不符合题意;

B、向澄清石灰水中通入CO2,生成了不溶于水的碳酸钙沉淀和水,有新物质生成,属于化学变化.故B选项不符合题意;

C、胆矾的研碎过程,只是物质的形态发生了改变,没有生成新物质,发生的是物理变化.故C选项符合题意;

D、镁与盐酸反应的过程中,有新物质氢气和氯化镁生成,属于化学变化.故D选项不符合题意;

故应该选C.

点评:解答本题要分析变化过程中是否有新物质生成,如果没有新物质生成就属于物理变化,如果有新物质生成就属于化学变化.

填空题
阅读理解

In the UK, we like a good bargain. People flock to the sales in January, when stores slash their prices to get rid of all their winter stock. But surprisingly, the British hate haggling. In markets you might see the odd British person battling with a stall owner to bring down the price of a pair of trousers or some furniture. Generally, though, people from the UK are too reserved to haggle. If we think the price of something we want is too high, we’ll simply move on and try somewhere else.

The act of bargaining with someone is very theatrical, in my opinion. It’s a test to see who can stand their ground for the longest. But it is not in British people’s nature to “perform” in public, especially around strangers.

However, in the US, people are generally more willing to haggle. And if you wander into a market, you’re likely to hear a number of phrases that Americans reserve for such occasions.

First, “you drive a hard bargain” is commonly said by the customer to indicate they think the stall holder is working very hard, probably a little too hard, to get the price he wants.

Or you might hear the buyer telling a stall holder that “the kid’s gotta have braces”, which means they don’t have enough spare money lying around to afford the price being offered.

If the customer is really shocked at the price suggested by the seller, they also might say “you’re killing me” to indicate that they think the price is far too high.

In Britain, it’s difficult to imagine anyone saying anything along these lines. If I were forced to bargain, I’d probably say, very simply: “I’m going to make you an offer.” If that offer were refused, I think I’d just walk away.

小题1:The underlined word “haggling” can be replaced by _______.

A.arguing

B.bargaining

C.performing

D.insisting小题2:Why don’t the British haggle generally?

A.They don’t think it is polite behavior.

B.They have sales every January.

C.They can always get a better price somewhere else.

D.They dislike openly expressing feelings or opinions.小题3:The underlined phrase “you drive a hard bargain” means_______.

A.the seller has a lot of deals on offer.

B.the buyer will make a final offer

C.the stall holder is too insistent

D.the buyer doesn’t have a lot of spare money小题4:What’s the author’s attitude toward bargaining?

A.Negative.

B.Careless.

C.Positive.

D.Critical.小题5:How does the passage mainly develop?

A.By providing examples.

B.By making comparision.

C.By analyzing causes and effects.

D.By following the order of importance.