如图中，套在竖直细杆上的环A由跨过定滑轮的不可伸长的轻绳与重物B相连．由于B的质量较大，故在释放B后，A将沿杆上升，当A环上升至与定滑轮的连线处于水平位置时，其上升速度V₁≠0，若这时B的速度为V₂，则（   ）

已知点F₁，F₂为椭圆$\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\left(a>b>0\right)$的左右焦点，若椭圆上存在点P使得|$\overrightarrow{P{F}_1}$|=2|$\overrightarrow{P{F}_2}$|，则此椭圆的离心率的取值范围是（　　）

      Dinner customs are different around the world. If you are a guest in Ghana(加纳),  this information will help you a lot.
      In Ghana, dinner is usually from four in the afternoon to six in the evening. But there are no strict rules about time. Whenever a guest arrives, a family offers food. When you go to a home, the person who receives guests takes you to the living room first. At this time everyone welcomes you. Then you go to the dinning room. There you wash your hands in a bowl of water. All the food is on the table. In Ghana you usually eat with your fingers. You eat from the same dish as everyone else .But you eat from one side of the dish only. It is not polite to get food from the other side of the dish. After dinner, you wash your hands again in a bowl of water.
      Most meals in Ghana have a dish called fufu. People in Ghana make fufu from the powder (粉末)of some plants. Sometimes they cut the fufu with a saw(锯子)because it is very hard. You must chew(咀嚼 )fufu well, or you may get sick. You eat fufu with the fingers of your right hand only.

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