-Why not join us in the game?

-__________. But I have to finish my homework first.[ ]

A. I'd love

B. I'd like to

C. I think so

D. I'm very tired

我国防洪存在的主要问题有哪些？（）

A.大江大河大湖防洪标准偏低

B.泥沙淤积严重，调蓄行洪能力降低

C.盲目围垦、人为设障，城镇建设挤占河道

D.水利工程老化失修，防洪效益衰减