What does the speaker mean

A．What would be the cost of your project

B．How much will it cost by the time you carry out the project

C．You know what your project would include.

D．That project of yours is very expensive.

少数种子萌发对光敏感，需（）才发芽。CO2对发芽的抑制作用与（）有关，当环境不利时其阻碍将就特别明显。