49 How did the Tangshan earthquake differ from the Haicheng earthquake that occurred a year earlier? (A)The Haicheng earthquake caused more damage to the power lines. (B)The Tangshan earthquake did not have successful early warnings. (C)The Tangshan earthquake happened in a region with no tectonic activity. (D)The Haicheng earthquake was much deadlier due to its timing.

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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