Food in underdeveloped countries still depends on imports, and they are powerless in the face of natural disasters. Agriculture, animal husbandry, and mining are the main economic sectors, and the labor force works mainly in such sectors. The level of culture and education and people's living standards are very low. This passage mainly supports the view that underdeveloped countries. ['Powerlessness in the face of natural disasters.', 'Only two economic sectors, agriculture and animal husbandry and mining.', 'People have a low standard of living and many illiterates.', 'Still in a very backward agricultural country or agriculture and animal husbandry stage.']