It is said that pandas ______ in our country year by year.
A：are being disappeared
B：are disappearing
C：will be disappeared
D：will disappear
对“母爱的体验是一种消极的体验”的正确理解是____。
具有坚固、轻巧、美观、易于加工等特点的高品质铝合金材料，被广泛用于“天宫一号”目标飞行器上，选用这种材料与下列哪个物理属性无关（）
