--According to my grandma it’s a good idea to eat chicken soup when you have a cold.---

问题补充：

--According to my grandma, it’s a good idea to eat chicken soup when you have a cold.

---, scientists agree with her too.

A. Once in a while

B. Believe it or not

C. On the contrary

D. Sooner or later

答案：

A. Once in a while

(答案→)B. Believe it or not

C. On the contrary

D. Sooner or later

解析：考查词组：A. Once in a while 偶尔B. Believe it or not信不信由你C. On the contrary 正相反D. Sooner or later迟早，句意：--根据奶奶所说，感冒了喝鸡汤是个好主意，--信不信由你，科学家也这么说。选B。