<span>A is the correct answer. The London Fog of 1952, also known as the Big Smoke, affected London for four days in December 1952. The pollution in the air was caused by burning coal and a lack of wind caused smog in the city. 4000 people died and 100,000 were injured.</span>
Answer:
B. geographic features protected the North China Plain.
Explanation:
The North China Plain is protected on four fronts by imposing geographical feature, which allowed early Chinese civilization to flourish without much external influence or threat.
To the north, the Gobi Desert, to the West, the Chinese Mountains, and the Tibet, to the South, more mountains, and to the West, the China Sea and the Pacific Ocean.
