根据 Birds of passage 可定位到第一段第五句:They even had an affectionate nickname, “uccelli di passaggio,”birds of passage。鉴于词汇推断题要到上下文找答案,可根据代词 they 锁定上文:About a quarter of all Italian immigrants, for example, eventually returned to Italy for good,“例如, 约有四分之一的意大利移民最终回到意大利再没回来。” 由此可以判断,birds of passage 是指在国外待了一段时间又回到母国的人。对应选项可确定答案 C。题目2:It is implied in paragraph 2 that the current immigration system in the U.S. ( ).
Aneeds new immigrant categories
Bhas loosened control over immigrants
Cshould be adapted to meet challenges
Dhas been fixed via political means