已知某文法G[S]：S->0S0 S->1，J从3推导出的符号串可用(25)(n>=0)描述。

A．(010)^n

B．0^n(10)^n

C．1^n

D．01^n0

The story is the same for many urban white-collar workers in China now: they’re putting in overtime to reduce the risk of being      .

A．laid down

B．turned off

C．laid off

D．turned down