13. Economists have been particularly surprised by favorable inflation figures in
Britain and the United States, since conventional measures suggest that both
economies, and especially America's, have little productive slack.
【分析】本句是 since 引导的原因状语从句，主句中 economist 是主语，谓语部
分是被动语态，宾语是 favorable inflation figures。从句中 conventional measures
是主语，谓语 suggest 后面是 that 引导的宾语从句，逗号之间是插入语，补充说
明。
【词汇】favorable 利好的；非常好的
      inflation n.通货膨胀
      convention n. 大会，会议；[僻义] 惯例--->conventional a. 传统的=
traditional ...