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把小白鼠和青蛙从25°C的室温中移至5°C的环境中,这两种动物的需氧量会发生什么变化? [ ]
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胡萝卜素有“小人参”之称,在结构层次上属于_____,常食能有效预防________( )
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________ is the first day of the week. [ ] A. Monday B. Saturday C. Sunday
1年前
A: Congratulations ! Your speech for the graduation ceremony(毕业典礼)is wonderful. B: Thanks a lot.
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We haven't seen ______ for four years.
1年前