海伦•琼斯在《建筑与民主》中说：“……公民的权利与规模意味着政治是在公开场合进行的。而雅典人通常在雅典卫城西面的普尼克斯山半圆形的山坡上集会。……它的形状确保了每一个参加者不仅能看到发言的人，也可以看到其他出席的人。”此段描述（       ）

甲、乙两车在平直公路上同向行驶，其v﹣t图象如图所示．已知两车在t=3s时并排行驶，则（   ）

    When you take a walk in any of the cities in the West, you often see a lot of people____ (walk) with dogs. It is still true that the dog is the most useful and faithful animal in the world. But the reasons why people keep a dog____(change). In the old days, people used to train dogs to protect themselves against the attacks from____beasts. And later they came____( realize) that the dog was not only useful____willing to obey its master. For example, when people used dogs for hunting, the dogs would not eat what they caught without____(permit). But now people in the city need not protect themselves against attacks of animals. Why do they keep dogs, then? Some people keep dogs to protect themselves from robbery, but the ____(important) reason is for companionship. For a child,____dog is his best friend when he has no friends to play with; for a young couple, a dog is ____child when they have no children; for old couples, a dog is also their child when their real children have grown up. So the main reason why people keep dogs has changed____protection to friendship.

B

    MSG (monosodium glutamate) is a food additive (食品添加剂), which has been widely used by many food factories all over the world since it appeared first in Japan in 1909.

    MSG is a substance that is added to some food to improve its original (原先的) taste and colour. It is used in foods around the world such as cakes, bread, frozen meats, fish and vegetables. In the beginning, people thought MSG was safe just like salt and sugar. However, in 1968 some people reported they seemed to have bad reactions (反应) to MSG after having had a meal at a restaurant. They included headaches and quick heartbeat (心跳). It was also reported that MSG excited a person's brain and caused his death in Japan. Scientists think that MSG may lead to many neurological disorders (神经紊乱). In mice studies done by a university, the evidence showed the mice didn't want to eat the food including MSG.

    Today many food companies “hide” MSG on food labels (标签) by using different names. If you see “natural flavorings”, “hydrolyzed protein” and “spices” in a food label, you are probably seeing a hidden way to “report” MSG in a food label. Every time we have a meal in a restaurant, we always feel the food very delicious to taste, but sometimes it is dangerous for our health because some poisonous food additives have been added to the food.

    To protect people's health, our governments, from central to local, are taking actions to stop factories producing poisonous food additives.

（2015•陕西）不等式组$\left\{\begin{array}{c}\frac{1}{2}x+1\ge -3\\ x-2(x-3)>0\end{array}\right.$的最大整数解为（　　）