—Of course. She is a kind woman, but she for about a month since she was killed in the accident.
A:has been dead
B:have died
C:has been died
D:has died
____×6=____
____÷3=____
____÷____=3
水稻生长期间,如果大部分叶片被害虫吃掉,水稻产量就会大幅度减少, 这是因为水稻的叶片无法进行____ .
月球对其表面物体的引力只有地球对地面物体引力的六分之一.设想我们乘宇宙飞船到达月球后,下列说法中正确的是( )