问题
单项选择题
Questions 15～18
A. A major earthquake took place somewhere northwest of the capital.
B. An instrument that could record the occurrence of an earthquake was invented.
C. The invention of the seismoscope was approved by the central government.
D. The earthquake damaged more than 400 houses in the capital city.
答案
参考答案：B
解析：
According to the talk, what happened in the year AD 1387