1 . About 400 years ago, Chinese explorer Xu Xiake travelled for 30 years across the country and wrote Xu Xiake’s Travel Notes based on lots of his strange ________________ (冒险). (根据汉语提示单词拼写)
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2 . It was unclear to researchers whether __________ (employ) caused poor health or whether poor health led to job loss.(所给词的正确形式填空)
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