A：全国金融中心、商业中心、科技中心
B：全国核心城市、最大城市、最重要的综合性工业城市
C：全国最大直辖市，政治中心
D：拥有浦东国家级开发区，是世界金融中心
One day，a hungry and thirsty____sees some nice grapes. He likes grapes. They are purple and ____. But the grapes are high. The fox ____get and eat them. A bird can____the grapes. She likes the sweet grapes. They are yummy. The fox is ____and angry. He says those grapes are sour. They are not____.
已知函数f(x)＝3x2＋2x＋1，若f(x)dx＝2f(a)成立，则a＝____．
甲、乙二人各乘一台升降机，甲看见楼房在匀速上升，乙也在匀速上升。乙看见楼房在匀速上升，甲在匀速下降。则他们相对于地面( )
