根据短文理解选择答案。
In many English homes people eat four meals a day. They have breakfast at any time from seven to nine in the morning. They eat porridge(粥), eggs or bread and drink tea or coffee for breakfast. Lunch comes at one o’clock. Afternoon tea is from four to five and dinner is about half past seven. First they have soup, 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. That is to say, most Englishmen have breakfast, lunch, afternoon tea and dinner in a day.
．让圆环沿杆滑下，滑到杆的底端时速度刚好为零．则在圆环下滑过程中