在判断甲状腺结节良恶性时，下列哪项不正确

A．单发结节恶性机会较多发结节大

B．囊性结节也可能是恶性的

C．“冷结节”都是恶性的

D．实性结节的恶性率较高

E．儿童单发结节的恶性机会较大

“ ____________ you’ve made! But you should still work harder,” the teacher said to the boy.

A．What great progress

B．How a big mistake

C．What a big mistake

D．How great progress