if we take short breaks__.19. Food in small pieces could be eaten easily from the sun twigs which_ turned into chopsticks.20. Walls make of adobe take in the heat from the sun on hot days and give out that heat_ during cool nights， thus warning the house.21. …
她是一个性格内向的人，不喜欢政治的风风雨雨，并且什么事情都想要和一小群顾问商量。Introvert一词源自于现代拉丁语introvertere，由前缀intro-加上vertere构成，指“内向的人”，与之相对的是extrovert。
