已知等腰三角形的周长为20cm，底边长为y（cm），腰长为x（cm），y与x的函数关系式为y=20﹣2x，那么自变量x的取值范围是（　　）

Tim, Sonia, Jim, Tina, Jenny and Ann are in the classroom. They find(发现) a pencil-box, a ruler, a pencil and a notebook on the desk. Tim asks Sonia, “Is this your pencil?” Sonia answers, “Yes, it is. Thank you.” Tim asks again, “Hi, Jim! Is this your ruler? “Jim answers, “No, it isn’t. It’s Tina’s ruler.” “Is this your notebook, Jenny?” asks Tim. “Yes, it is,” answers Jenny.” Ann, is this your pencil-box?” asks Tim. “Yes, it is. Thank you.” answers Ann.

根据短文内容，判断下列句子正(T)、误(F)。