Mushrooms grow in dark corners, get no sunlight, no fertilizer, and spontaneously extinguish themselves. Only when they rise high enough will they start to be noticed by humans, but at this time they can already accept sunlight. People will see this phenomenon. Called the "Mushroom Effect". According to the above definitions, Which of the following are the mushroom effects:. ['Xiao Liu is an MBA who returned from studying abroad, and served as a department manager as soon as he entered the company.', 'Actor Xiao Wang often only played a small role for a few months when he first entered the industry, and later he became famous.', 'A unit has a system for managers at each level, and cannot be promoted without pre-training their own successors.', 'Xiao Li has been mediocre after work, and he was rewarded by a chance by chance. He was entrusted with a heavy task in a later large project.']