如图,矩形ABCD中,AB=3,BC=4,点E是射线CB上的动点,点F是射线CD上一点,且AF⊥AE,射线EF与对角线BD交于点G,与射线AD交于点M;
①—Is she seven?
—No, she isn't. She's eight.
②— Is she ten?
—Yes, she is.
③— Is she nine?
— Yes, she is.
④—Is she nine?
—No,she isn't. She's seven.
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植物群落随着海拔高度的上升而发生变化的主要原因是( )
对下表解读正确的是 ( )
主要经济体国民生产总值占世界国民生产总值的比重变化(%)