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

问题补充：

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

---,scientists agree with her.

A. Sooner or later

B. Once in a while

C. To be exact

D. Believe it or not

答案：

A. Sooner or later

B. Once in a while

C. To be exact

(答案→)D. Believe it or not

解析：考查情景交际。句意：--按照我奶奶的说法，感冒时，喝鸡汤是一个很好的主意。--信不信由你，科学家也同意她的观点。A迟早；B偶尔；C确切地说；D信不信由你。故选D。