1。 Distinguish between positive and negative markets; Then determine the buy or sell arbitrage; A: Yes, buy arbitrage, spread to expand profits, spread100; B: In the opposite direction, selling arbitrage, the price difference reduces profits, and the price difference is 50; C: positive, buy arbitrage, spread 200; D: positive, buy, price difference150; Please explain why you want b? I don't know why I chose B. I'm asking.

2. Divided into buying arbitrage and selling arbitrage; Suppose 1 1 month >; Selling arbitrage in July (reducing profit), the profit is 10 cents, that is, the previous price difference is 15+ 10=25, so the 1 1 month contract is 905; Suppose July > 1 1 month, buy arbitrage (increase profit), and the profit is 10 cent, that is, the previous price difference is 15- 10=5, then 1 1 0.

I haven't read the expired index and option, so I don't know if I did it right, so I won't explain it;