A:此时太阳直射点位于(23°26′N,60°E)
B:此时图中昏线为①线
C:此时图中晨线为②线
D:此季节是南极科考的最佳时期
HIV主要侵犯并瓦解人体的( )
Those who think that sharks are _____ strong _____ be endangered are wrong.