Half of the land there ______to the Smiths, but half of the apple trees ______ ours. A. belong, are B. belongs, is C. belongs, are D. belong, is 答案:C据气象台预报:在A市正东方向300km的B处有一台风中心形成,并以每小时40km的速度向西北方向移动,在距台风中心250km以内的地区将受其影响,从现在起经过多长时间,台风将影响A市?持续时间多长?(精确到0.1h)