The fundamental reason for his illness has never been discovered. ‍ (1.5分) * A
obvious

 * B
physical

 * C
severe

 * D
basic

问答题Priscilla’s contract cannot be terminated for five years. ​ (1.5分) * A changed * B renewed * C publicized * D ended

问答题Would you please elaborate on your first point? ‍ (1.5分) * A give more information about * B write down * C indicate * D begin the discussion on