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单项选择题What does the passage mainly discuss

A. Patterns of erosion in different mountain ranges.
B. Forces that made the Grand Canyon.
C. The increasing pollution of the Colorado River.
D. The sudden appearance of the Grand Canyon.

单项选择题Which of the following would be the best title for the text

A. Trade War between Japan and the US
B. It’s time to Remove Japanese Trade Barrier
C. The US Desires to Reduce a Japanese Surplus in Trade
D. Why Japan Won’t Submit to US Trade Demands