问题如下：
Country X is a developed country and aims to realize a continuously economic growth in the long term. The least feasible way is to
选项：
A.increase the labor supply
B.increase the physical capital of each labor
C.increase the productivity per worker
解释：
B is correct. The rate of increase in labor force and labor productivity will determine the sustainable economic growth. A developed country keeps the capital per worker at a high level and is experiencing the diminishing of marginal productivity. Therefore increase the physical capital of each labor is a feasible method to keep a continuous economic growth.
考点：Economic Growth and Sustainability
解析：动力和劳动生产率的增长速度将决定经济的可持续增长。发达国家人均资本保持在较高水平，边际生产率递减效应明显。因此，增加每个劳动力的实物资本不是保持经济持续增长的可行方法。所以B选项入选。
增加劳动力和劳动力的生产率将会有效提高一国经济经济增长，所以A,C选项不入选。
答案解析：
The rate of increase in labor force and labor productivity will determine the sustainable economic growth. A developed country keeps the capital per worker at a high level and is experiencing the diminishing of marginal productivity. Therefore increase the physical capital of each labor is a feasible method to keep a continuous economic growth.
最后一句话是不是说反了啊
