A:干旱环境中的大熊猫
B:引入狼后的草原兔
C:干旱环境中的东亚飞蝗
D:地面进行硬化后的家鼠
向量a→,b→,c→在单位正方形网格中的位置如图所示,则a→•(b→+c→)=____
看图,配对,将句子编号写在相应的横线上。
A. The pears are juicy and sweet. Here you are.
B. - How is the juice? - It's very sweet.
C. Smell the soup. It's very nice.
D. - How is the rice, Peter? - It's yummy.
① ____
② ____
③ ____
④ ____
人体将代谢废物如二氧化碳、____等以及多余的水和____排出体外的过程称为排泄.