Circle the correct letters A-C.

The speaker compares a solar eclipse today to a（）

单项选择题During the Tang era, a government doctor's annual salary depended upon（）

A.the effectiveness of his treatment.
B.the extent of his medical experience.
C.the number of people he had successfully trained.
D.the breadth of his medical expertise.

单项选择题Which of the following contravened the law during the Tang era（）

A.a qualified doctor's refusal to practise
B.the use of unorthodox medical practices
C.a patient dying under medical treatment
D.the receipt of money for medical treatment