“洹水安阳名不虚，三千年前是帝都”这是著名史学家和考古学家郭沫若同志当年写下的诗句，该诗句中的“安阳”附近过去曾经是哪个朝代的都城（    ）

钩码重均为0.5N），要使杠杆水平平衡，需在B点悬挂　____ 　个钩码；取走悬挂在B点的钩码，改用弹簧测力计在C点竖直向上拉，使杠杆水平平衡，测力计的拉力为　____ 　N，如改变测力计拉力的方向，使之斜向右上方，杠杆仍然水平平衡，测力计的读数将____ ．

    Many teenagers(青少年) feel that the most important people in their lives are their friends. They believe that their family members, and in particular(尤其是) their parents, don't know them as well as their friends do. In large families, it is quite often for brothers and sisters to fight with each other and then they can only go to their friends for advice.

    It is very important for teenagers to have one good friend or a circle of friends.

    Even when they are not with their friends, they usually spend a lot of time talking among themselves on the phone. This communication is very important in children's growing up, because friends can discuss something difficult to say to their family members.

    However, parents often try to choose their children's friends for them. Some parents may even stop their children from meeting their good friends. The question of “choice” is an interesting one. Have you ever thought of the following questions?

    Who chooses your friends?

    Do you choose your friends or your friends choose you?

    Have you got a good friend your parents don't like?

    Your answers are welcome!

Has he ____(安排) for a car to pick them up from the airport?

2011年秋冬季节，北方局部地区鲜有降雨，造成历史罕见的大旱。受灾麦田达1.43亿亩。不少麦苗枯死……根据以上信息和所学生物学知识回答下列问题：