Analysis of test questions: The basic conditions for living things are nutrients, sunlight, air and water, suitable temperature and a certain living space, and the biosphere can meet the needs of living things. Therefore, when astronauts fly into space by spaceship, they have already left the biosphere, and they must bring enough substances necessary for maintaining life activities from the biosphere, such as oxygen bags, mineral water and various foods.
Test center: this question examines the environmental conditions for biological survival.
Comments: This topic is called basic knowledge, and the key to solving this kind of topic is to remember the basic conditions for biological survival.