unit 1 low-carboneconomy text a creating a low-carbon economy text b living a low-carbon lifestyle unit 2 a harmonious society text a building a harmonious society text b china: roused by disas ter unit 3 culture shock text a the rotary youth exchange experience: culture shock text b understanding in terpersonal relationships in the chinese con text unit 4 artificial in telligence text a the future of artificial in telligence text b revenge of the nerds unit 5 success and happiness text a the assessor of success (adap ted) o8o text b why we're happy