What is pretty much settled according to Paul Sereno?
A、Half of the dinosaurs lived alone.
B、Most dinosaurs moved long distances
C、Many dinosaurs settled in the north.
D、Some dinosaurs lived in big groups.
Without the help of people from every corner of the world, people in Wenchuan County, Sichuan Province__________recovered very quickly from the May Twelfth Earthquake.
A、must not have
B、couldn‘t have
C、may not have
D、can‘t have
Henry will not be able to attend the meeting tonight because__________