如图,某数学兴趣小组将边长为3的正方形铁丝框ABCD变形为以A为圆心,AB为半径的扇形(忽略铁丝的粗细),则所得扇形DAB的面积为( )
A:6
B:7
C:8
D:9
劳伦兹对小野雁学习行为的研究,属于( )
目录
第三回 史大郎夜走华阴县 鲁提辖拳打镇关西
第四回 赵员外重修文殊院 鲁智深大闹________
第五回 小霸王醉人销金帐 花和尚大闹________
第六回 九纹龙剪径赤松林 鲁智深火烧________
第七回 花和尚倒拔垂杨柳 約子头误入白虎堂
第八回 林教头刺配沧州道 鲁智深大闹________
I'm Peter. There are four people in my family. They are my father, my mother, my grandfather and me. I'm twelve. My birthday is on 15th March. My parents are both doctors. They help people. Their birthdays are both in May. My grandfather is old. He is sixty-five. His birthday is on 9th June. He likes reading. I like reading too. I want to be a teacher in the future. I want to teach Chinese in a school.