In England ,people don't often talk to each other when they travel. If you get on a bus or a train. you can see people sitting and looking out of the window. Other people may read books or newspapers.
When you meet English people, they often start a conversation by talking about the weather . So when you meet somebody in England, you can say, "Nice weather for the time of the year!"
"But it was a little cold yesterday, "somebody may answer.
"But it will get a bit warmer later,"you can say.
Talking like this, they will think,"How friendly you are!"

发达国家最为集中的地区是（　　）

下列反映二战后殖民体系的崩溃和亚非拉国家为捍卫国家主权、发展经济的重大历史事件，按时间先后顺序排列正确的是（    ）

①万隆会议    ②纳米比亚独立    ③巴拿马收回运河主权    ④非洲独立年

如图（a）所示，光滑绝缘水平面上有甲、乙两个点电荷．t=0时，甲静止，乙以初速度6m/s向甲运动，甲的速度为0．此后，它们仅在静电力的作用下沿同一直线运动（整个运动过程中没有接触），它们运动的v﹣t图象分别如图（b）中甲、乙两曲线所示．则由图线可知（   ）