47 Why did workers in deep coal mines have a higher chance of survival than people on the surface? (A)The mines were reinforced with earthquake-resistant materials. (B)They were notified by early warning systems before the shaking started. (C)They were closer to the unidentified fault line. (D)Seismic vibrations are less powerful at great depths.

50 Which of the following best summarizes the main purpose of the passage? (A)To emphasize the safety of underground structures like coal mines during natural disasters. (B)To provide a detailed comparison between the seismic activity in Tangshan and Haicheng. (C)To explain the causes and consequences of the Tangshan earthquake while highlighting its importance to modern safety. (D)To argue that the official death toll reported by the Chinese government was intentionally inaccurate.

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