Zhang Hong is said___________by heart 2000 words up to now .

A．that she has learned

B．to have learned

C．to learn

D．having learned

关于霍乱弧菌的描述，正确的是( )

A．革兰染色阳性，有芽孢、荚膜和鞭毛

B．革兰染色阴性，有鞭毛，运动极为活跃

C．需氧，耐酸不耐碱

D．古典生物型比埃尔托生物型的抵抗力强

E．产生的内毒素是重要的致病因子