① Xiao Zhang is one of the senior employees of PepsiCo in China.② Then it is possible that Xiao Zhang only drinks Coca-Cola. In the dialogue, a premise implicit in the statement of ② is: (). ['PepsiCo is a subsidiary of Coca-Cola.', 'Zhang is an unimportant employee of The Coca-Cola Company.', 'Coke tastes very similar.', 'In general, all senior staff only drink our products.']