Doctors believe that only a small number of people of this kind of disease.A. is in dange

问题补充：

Doctors believe that only a small number of people of this kind of disease.

A. is in danger

B. is in a danger

C. are in danger

D. are in the danger

答案：

A. is in danger

B. is in a danger

(答案→)C. are in danger

D. are in the danger

解析：考查主谓一致。A number of +复数名词作主语谓语用复数形式。处于危险中be in danger of注意danger 前不用任何冠词。医生认为只有一小部分人有危险得这种病。