标志着恶性组织细胞病的病情已严重的骨髓象表现为（）

A.正常

B.增生明显活跃

C.增生极度活跃

D.增生活跃

E.增生差

(湘郡生试题)   I was really surprised to find out that the first public showings of wireless TV transmissions took   41   way back in 1925. It took another three years before there was any regular public broadcasting.   42  , I think people must have found   43   quite a delight when color TV was first broadcast in 1929.   44   , within the next 65 years, people would be able to choose   45  to watch from a   46  of 200 different channels because   47 cable TV. It is reported   48  in 1998, 66 percent of households in the USA had cable TV.