问题 选择题

下列关于溶液特征的叙述正确的是

A.溶液都是澄清、透明、无色的

B.溶液是均一、稳定的化合物

C.一种溶液中各部分浓度和性质相同

D.溶液中的溶剂一定是水

答案

答案:C

A、溶液不一定是无色的,例如硫酸铜溶液是蓝色的,故A不正确;

B、溶液属于混合物;故B不正确;

C、由于溶液的特点是均一的、稳定的混合物所以一种溶液中各部分浓度和性质相同.故C正确;

D、溶液中的溶剂不一定都是水,如汽油、酒精等都可作溶剂.故D不正确;

多项选择题
单项选择题

Massive changes in all of the world’s deeply cherished sporting habits are underway. Whether it’s one of London’s parks full of people playing softball, and Russians taking up rugby, or the Superbowl rivaling the British Football Cup Final as a televised spectator event in Britain, the patterns of players and spectators are changing beyond recognition. We are witnessing a globalization of our sporting culture.

That annual bicycle race, the Tour de France, much loved by the French is a good case in point. Just a few years back it was a strictly continental affair with France, Belgium and Holland, Spain and Italy taking part. But in recent years it has been dominated by Colombian mountain climbers, and American and Irish riders. The people who really matter welcome the shift toward globalization. Peugeot, Michelin and Panasonic are multi-national corporations that want worldwide returns for the millions they invest in teams. So it does them literally a world of good to see this unofficial world championship become just that.

This is undoubtedly an economic-based revolution we are witnessing here, one made possible by communications technology, but made to happen because of marketing considerations. Sell the game and you can sell Coca Cola or Budweiser as well.

The skilful way in which American football has been sold to Europe is a good example of how all sports will develop. The aim of course is not really to spread the sport for its own sake, but to increase the number of people interested in the major money-making events. The economics of the Superbowl are already astronomical. With seats at US $125, gate receipts alone were a staggering $10,000,000. The most important statistic of the day, however, was the $100,000,000 in TV advertising fees. Imagine how much that becomes when the eyes of the world are watching.

So it came as a terrible shock, but not really as a surprise, to learn that some people are now suggesting that soccer change from being a game of two 45-minute halves, to one of four 25-minute quarters. The idea is unashamedly to capture more advertising revenue, without giving any thought for the integrity of a sport which relies for its essence on the flowing nature of the action.

Moreover, as sports expand into world markets, and as our choice of sports as consumers also grows, so we will demand to see them played at a higher and higher level. In boxing we have already seen numerous, dubious world title categories because people will not pay to see anything less than a "World Title" fight, and this means that the title fights have to be held in different countries around the world!

Which of the following is NOT related to the massive changes()

A. Good economic returns

B. Revival of traditional games

C. Communications technology

D. Marketing strategies