If my opponent attack me with a Arkham inmate and use Fear and confusion (While attacking this turn, characters you control get +1 ATK.
Whenever an Arkham Inmates character you control attacks a character this turn, exhaust that character.) I become exhaust, then i use cosmic radiation to ready my self can he flip a other Fear and confusion and exhaust me again during the same attack?

The key text here is: Whenever an Arkham Inmates character you control attacks a character this turn, exhaust that character.

When he attacked your character, it was exhausted because of the effect. The keyword in here is whenever: he only attacks your character once. Playing multiple copies won't "re-exhaust" you if you ready because of an effect.

The +1 ATK would stack, though. All of his characters would be at +2 for the turn.

I'm pretty shure 'attacks' only triggers when the attack becomes legal (i.e. once when attacker and defender are legal). It's like glass jaw, you can play it anytime during an attack, but you'll only get the -3, not the exhaust part.

So no, you woudn't have to exhaust

The way Fear and Confusion is worded, it is a triggered ability. It triggers when your character attacks, meaning upon exhaustion to attack. Triggers can only go on the chain once so a second Fear and Confusion would only add +1 ATK, there would be no additional exhaustion.

Look at it like this:

Player 1 plays Fear and Confusion

Player 2 passes, F&C resolves

Player 1 Declares an attack

Player 2 passes

Character exhuausts to attack, Fear and Confusion Trigger goes on the chain. Until that chain resolves, you can exhaust that character for anything you want to do.

F&C trigger resolves. Player 2 exhausts his character. Player 2 Chains Cosmic Radiation to F&C Trigger resolution.

Player 1 Chains Fear and Confusion to Cosmic Radiation.

Fear and Confusion resolves, giving attacking character +1 ATK but the trigger point is passed. There is no additional exhaustion.

That was long and kind of complicated, but I hope it helps. :)

Edit: Whoa. I took WAY too long.

ok and if i attack with super skrull (When Super Skrull attacks or is attacked, you may discard a card from your hand. If you do, Super Skrull gets +3 ATK and +3 DEF for this attack, ready all front row army Skrull characters you control, and each of your opponents loses 3 endurance. )
Can i discard a card when i attack, wait fr the reaction of my opponent then discard a other card to get a other +3+3? and thk for the answer

Nope. Super Skrull's discard opportunity only goes on the chain once, so you can only discard to it once no matter how many times you get passed priority.

Ah, here's a question back to you. Can Kraven the Hunter choose more than one name, or Rose Psychic gain more than 6 endurance?

I'm trying something out on a few questions, so bear with me. It's sort of in the "Teach a player to fish" line of thinking.