跑或者跳时，人的呼吸次数比休息时（   ）。

哺乳动物的运动系统由骨和肌肉组成              （    ）

    Mrs Smith's living room is large. There is a television in the room. The television is near the window. There are some magazines on the television. There is a table in the room. There are some newspapers on the table. There are some armchairs in the room. The armchairs are near the table. There is a stereo in the room. The stereo is near the door. Mrs Smith often listens to music from it.

经济重心南移是中国古代重要的历史现象．关于这一现象的表述，符合史实的是（    ）