题目

物体由静止开始运动，加速度恒定，在第7s初的速度是2.6m/s，则物体的加速度是A.0.4m/s2 B.0.37m/s2 C.2.6m/s2 D.0.43m/s2 答案：【答案】D【解析】物体的加速度A．0.4m/s2，与结论不相符，选项A错误；B．0.37m/s2，与结论不相符，选项B错误；C．2.6m/s2，与结论不相符，选项C错误；D．0.43m/s2，与结论相符，选项D正确；This is a process          happens when land becomes desert        people cut down trees and dig up grass. A．when; becauseB．that; because ofC．when; because ofD．which; because