The scientists conducted an 8-week experiment: three batches of experimental rats were exposed to light for 16 hours during the day, and then in full darkness, dark light, and light for 8 hours each day. This was the case during the experiment. The food types and food intake were all the same. It was found that rats in the dark environment at night and the lights turned on showed weight gain. Based on this, the researchers concluded that the general obesity of westerners and the brightly lit street scene at night It is closely related to the light of computers and televisions. If the following items are true, the above conclusions can be questioned most:. ['The experimental time is only 8 weeks, which is too short for young rats. The experimental time should be extended.', 'Westerners are not generally obese, people with middle and higher incomes attach great importance to weight problems, and often carry out body management such as fitness.', 'According to statistics, in western cities with bright streetscapes at night, most of those who often receive computers and televisions are not obese.', 'The experimental mice in dark light at night and the light environment are different from the experimental mice in a dark environment at night. The former eats at night, while the rats at night have a low metabolic rate, low energy consumption and easy weight gain.']