21.【2012届湖北省武汉市高三适应性训练】The ________ in Chinese exports in recent years has resulted in a flood of inexpensive goods for American consumers．
A．immigration B．introduction C．explosion D．investment
22. World Expo 2010 Shanghai China, a grand-scale global event, has ______ the significant theme “Better City, Better Life.”
A. abandoned B. adopted C. advocated D. adapted
