A. at the bottom of B. in exchange for C. in the name of D. on the basis of 参考答案:D 答案解析:[分析] 本题考查介词词组辨析。选项中at the bottom of在…底部“in exchange for交换;in the name of凭着…,以…名义;on the basis of在…基础
参考答案:after the new invention was put into use/practice/operation 答案解析:[考点] ①after引导时间状语从句;②被动语态;③“投入使用”put into practice/use/operation。 [点拨] 由“在……之后”可确定是由after引导的时间状语从