Question 9 The contrast drawn between the Haicheng earthquake in Paragraphs 2 and 3 and the Tangshan earthquake in
Paragraph 3 contributes to a central idea that earthquakes are
А
all preceded by reliable signs, and therefore scientists have the ability to predict earthquakes.
B
controlled by observable factors that just average citizens can report to the authorities.
с
not always predictable, so new methods and more studies need to be conducted.
D
not often studied because there is no possible solution to the problem of predicting
earthquakes.