A:送到海底越深的地方,CO2溶解得越多,同时CO2可能液化甚至变成干冰
C:把CO2输送到海底,这是人类减缓空气中CO2浓度的增加的唯一办法
B:把CO2输送到海底,会使海水酸性增强,破坏海洋生态环境
D:要减缓空气中CO2浓度的增加,最有效的措施是使用新能源,植树造林等
I want to buy a nice present _______ my mother and I must give it ______ her myself.
黄河进入下游平原地区,河道变宽,坡度变缓。河水减慢,携带的泥沙沉积下来,使河床抬高,成为____ 。
Cathy was born blind(天生是盲的), so she has __________ seen our beautiful world.