A．situations
B．choices
C．directions
D．positions
day when he let a bicycle ran right into him. He never watches
氮原子核由两个质子与两个中子组成，这两个质子之间存在着万有引力、库伦力和核力，则3种力从大到小的排列顺序是
A．核力、万有引力、库伦力B．万有引力、库伦力、核力
C．库伦力、核力、万有引力D．核力、库伦力、万有引力
Amy joined a painting group but didn’t seem to _______, so she left.
A. show off B. go up C. fit in D. come over
A．easier
B．newer
C．earlier
D．higher