A:杭州夏季昼长夜短
B:南半球河流右岸多沙滩
C:五带划分
D:南极洲夜空常出现极光
—You must be very excited about going to England for further study.— , but I am afraid I won't do well because my English is poor.
下列有关动物激素功能的叙述中不正确的是 ( )
甲、乙两物体在同一地点同时开始做直线运动的v﹣t图象如图所示.根据图象提供的信息可知( )
某种细胞的直径是5×10﹣4毫米,这个数是( )