(30) civilizations developed, greater work efficiency came to be demanded, and (31) tools became more (32) . A tool would (33) a function until it proved (34) in meeting human needs, at which point an improvement would be made. One impetus for invention has always been the (35) for speed and high-quality results--provided they are achieved (36) reasonable costs. Stone pebbles were sufficient to account for small quantities of possessions, (37) they were not efficient enough for performing sophisticated mathematics. However, beads arranged systematically evolved into the abacus. The (38) of this tool can be (39) to the development of commerce in the East around 3000 B.C., and the abacus is known (40) by the ancient Babylonians, Egyptians, Chinese, etc.
A.imagination
B.creativity
C.necessity
D.illusion
第6题
A.IC卡电子现金账户资金不计息,不挂失。
B. IC卡电子现金账户资金不计息,可挂失。
C. IC卡电子现金账户资金计息,但不挂失。
D. IC卡电子现金账户资金可计息,可挂失。
第7题
A.IC卡电子现金账户资金不计息,不挂失。
B. IC卡电子现金账户资金不计息,可挂失。
C. IC卡电子现金账户资金计息,但不挂失。
D. IC卡电子现金账户资金可计息,可挂失。
第8题
A.IC卡电子现金账户不挂失
B.IC卡电子现金账户内资金不计息
C.IC卡电子现金不支持取现业务
D.IC卡电子现金账户需凭密码进行脱机消费
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!