民族精神的核心是爱国主义。                        （   ）

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)。

材料一：东北地区≥10 ℃积温和粮食作物(图中阴影)分布图。

材料二：东北地区和长江三角洲地区人均耕地面积(图乙)和谷物单产(图丙)比较。

材料三：东北地区是我国重要的工业基地，良好的工业基础为农业发展提供了机械设备、化肥等生产资料。