BEIJING, Aug. 20 (Xinhua) — As a new channel for foreign trade, cross-border e-commerce is injecting fresh impetus into China-Africa trade, bringing popularity to more and more African commodities in the Chinese market. In the first half of the year, the trade volume between China and Africa increased 16.6 percent to 137.4 billion U.S. dollars, among which China's imports from African countries hit 60.6 billion U.S. dollars, rising 19.1 percent year on year, according to the Ministry of Commerce. As Africa's largest trading partner for more than 10 consecutive years, China is striving to expand its e-commerce cooperation with the…