It is essential that____________(每个人都为紧急情况做好准备).

A．earn much more than their predecessors
B．have been affected by the economic downturn
C．gain a competitive edge with good education
D．are undoubtedly ideal workers for the economy

A．the achievement gap can be narrowed easily
B．it is unreasonable to relate low achievement to poverty
C．physiological stress works on achievement indirectly
D．it is impossible to achieve the goal of equal performance