I 语言知识及应用（共两节，满分45分）
第一节 完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从1~15各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
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 ___1___ personality when you're awake because you can control your behaviour，but when you're asleep， your sleeping ___2___ shows the real you. In a normal night，of course，people ___3___ change their position. The important position is the one that you go to sleep in.
