The central idea is what the main thing. For this, I think the central idea is simply Cactuses.
I'm not sure what another supporting detail can be, but if there's a back side, or another page about cactuses, I can sure help! But if that's the only side, ask your parents. xD
Answer:
How glad I am to see you! I just adore you and your recipes are ready to watch for days!
Could you translate this to english please? if you can then maybe i could answer your question
