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1、Grade8 Book2 Units 7~8Ⅰ.完形填空Whenpeoplethinkoftigers,theythinktheyarestronganddangerous.Butnow,thebiganimalneedsourhelp.Therewereonceeightkindsof__1__intheworld,butthreediedoutduringthe20thcentury.Inthelast70years,the__2__ofSiberiantigershasgonefromasmany