In an office, 40 percent of the workers have at least 5 years of service, and a total of 16 workers have at least 10 years of service. If 90 percent of the workers have fewer than 10 years of service, how many of the workers have at least 5 but fewer than 1 0 years of service ？（）

A．48

B．64

C．80

D．144

E．160

       中 * * 党在探索建设社会主义道路过程中曾经形成过一些错误理论观点、政策思想和实践经验，这些错误对当时的社会造成很大影响，以下表现属于其中的是

①大跃进　②人民公社化运动　③ * * 　④“两个凡是”思想　⑤对外开放　⑥农业生产合作化 [ ]

A、①②③⑤⑥　　

B、①②③⑥　　

C、①②③④⑥　　

D、①②③④