疫毒痢临床可见的症状是（）

A.壮热口渴

B.痢下脓血

C.神昏惊厥

D.起病急骤

E.腹痛剧烈

Which of the following statements about a monopolist is least accurate（）

A. A profit-maximizing monopolist will expand output until marginal revenue equals marginal cost.

B. A profit-maximizing monopolist will supply less of his product than the amount consistent with the conditions of ideal static efficiency for an economy.

C. A monopolist will always be able to earn economic profit.