The original ecological environment of the Qinghai-Tibet Plateau occupies a special place in the world, but the ecological environment is very fragile, once damaged, it is irreversible, and some plants need to be restored for hundreds of years. Alpine, drought, primitive and extremely fragile is this region Significant characteristics of the ecological environment. What do the following options match the original meaning? ['The plants on the Qinghai-Tibet Plateau are very fragile, and damage is irreversible.', 'Alpine and drought make the ecological environment of the Qinghai-Tibet Plateau very fragile.', 'The ecological environment of the Qinghai-Tibet Plateau is the oldest and most primitive.', 'Although the ecological environment of the Qinghai-Tibet Plateau is primitive, its ability to resist damage is weak.']