一轻质弹簧的下端固定在容器底部，上端放一铁质实心小球（不连接），如图所示，向容器中缓慢倒入水，使小球完全浸没且静止在水中，此时小球受到的力（　　）

如图，无法保证△ADE与△ABC相似的条件是（　　）

    It's seven o'clock on the morning of October 2nd.The Greens are going to Qingdao. It is near the sea.

    "Can we have breakfast now?" asks Gina. "No," says her mother. "We must leave now. We will have breakfast when we get to the seaside." "I am ready," Gina says.

    The family go into the car. Dad drives. In the front of the car is Mike. He is fourteen. He doesn't like to talk. He just listens to music. In the back of the car are Gina, Gina's mother and Ellen. Gina is nine and Ellen is three.

    Dad drives very fast. "You're driving too fast," says Mum.

    Dad laughs and drives slowly. There aren't many cars. They arrive in Qingdao at nine o'clock. It is a sunny day, and the sea is very blue.

    "There's a restaurant," says Gina. "May I have breakfast there?"

    "Yes," says Mum. They go into the restaurant and have a big breakfast.

    "Oh, I am full," says Gina. "How can I swim?"

    "Easy," says Mike. He runs to the sea. Gina follows him happily.

⑴～(2)题完成句子；(3)题简略回答问题；(4)题找出文章主题句；(5)题将文中画线句子译成汉语。