__________ (根据记录证实), China’s human rights situation has been steadily improving over the years.

A．dragged
B．united
C．drawn
D．hauled

A．well-erected structures do not collapse
B．the existent quake-resistant buildings need to be redesigned
C．steel-frame buildings survive any earthquakes
D．seismic (地震的) engineering has improved well enough for structures to resist quakes