A:给瓶内打气时,外界对瓶内气体做功
B:瓶塞跳起时,瓶内气体温度升高
C:给瓶内打气时,瓶内气体内能增加
D:瓶塞跳起时,瓶内气体对外做功
World Wildlife Fund ____(感激) very much the efforts that China has made to protect endangered species from being further endangered.