A:could have been avoided
B:could have avoided
C:would have avoid
D:should have been avoided
If we do nothing, there_______ no more giant pandas in the world.
已知直线a,b被直线c,d所截,a∥b,且直线c⊥直线a,直线d⊥直线b,则直线c与直线d之间的位置关系是____ .(填“平行”“相交”或“垂直”)
辨字组词
赔____ 敝____ 撒____
陪____ 敞____ 撤____
淮____ 尊____ 既____
准____ 遵____ 即____
持____ 炮____ 担____
挂____ 跑____ 坦____