题目

Everyone has got two personalities—the one that is shown to the world and the other that is secret and real. You don't show your secret personality when you are awake because you can control your behavior，but when you are asleep，your sleeping position shows the real you. In a normal night，of course，people frequently change their positions. The important position is the one that you go to sleep in. If you go to sleep on your back，you're a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don't like to displease people. So y既有“三北”防护林，又有长江中上游防护林的省区是（　　） A、四川、青海B、甘肃、陕西C、宁夏、山西D、西藏，四川