①宗法制遭到破坏 ②分封制遭到破坏 ③中央集权制度受到削弱 ④郡县制受到挑战
A：①②
B：①③
C：②③
D：③④
阅读理解
This is my new bedroom. There is a small shelf on the desk. Two end tables are near the bed and a photo is over the bed. The chair is in front of the desk. Look at my shoes. They are under the bed. I clean my bedroom on Sunday. I empty the trash every day. Mom says I'm a helpful boy.
世界上降水最多被称“世界的雨极”的地方（ ）
把一石块挂在弹簧测力计下，称得重为10N，把它全部浸没在水中，弹簧测力计的示数是6N．求：
