将下面的密封装置放到温度适宜的环境中培养。较长一段时间后，玻璃弯管中有色液滴的移动状态及原因是(　　)

    In many English homes people eat four meals a day: breakfast, lunch, tea and dinner. People have breakfast at any time from seven to nine in the morning. They eat porridge，eggs or bread. English people drink tea or coffee at breakfast. Lunch comes at one o'clock. Afternoon tea is from four to five in the afternoon and dinner is about half past seven. First they have soups, and then they have meat or fish with vegetables. After that they eat some other things, like bananas，apples or oranges. But not all English people eat like that. Some of them have their dinner in the middle of the day. Their meals are breakfast, dinner, tea and supper and all these meals are very necessary.

中央气象台天气预报：青岛3月17日气温为2～8℃，2℃是指一天中什么时候的气温（      ）