【单选题】听力原文:A: 8734059. B: May I speak to Thomas Nelson? A: This is Thomas speaking. May I ask who's calling? B: This is Lee Ting, the secretary at the Dean' Office. A: Hi, Miss Lee, what's up? B: I'm callin...
A.
To invite him to attend a seminar.
B.
To inform. him about some changes in the arrangement for his seminar.
C.
To invite him to visit the lab.
D.
To inform. him that the seminar has been postponed.
【单选题】Gas prices recently increased by 25%. In response, purchases of gasoline decreased by 5%. Based on this data, the price elasticity of demand for gas is: