A. 9.6 billion B. 9.6 million C. 1.4 billion D. 1.4 million
A. Yellow River B. Yangtze River C. Zhujiang River
A. Tai Mountain B. Hua Mountain C. Yellow Mountain D. Heng Mountain
A. 13 B. 53 C. 4 D. 36
A. December, 1999 B. October, 2020 C. July, 1997 D. October, 2018