正常人骨髓有核细胞增生一般为 （）

A.增生极度减低

B.增生减低

C.增生活跃

D.增生极度活跃

E.增生明显活跃

Teachers, train drivers, oil refinery workers and other French employees have _____to strike in protest of President Sarkozy’s pension (养老金) reforms.

A．connected

B．united

C．joined

D．attempted