家鸽受精卵的发育开始于( )
A:雌鸽体内
B:鸽卵产出后
C:孵化时
D:孵化一段时期之后
生成氧气的质量为多少克?固体残余物中含有什么物质?质量各为多少?
It took me quite a long time to get to the school. It was _______ journey.