1. According to the speaker, which type of the country in the following has the fastest growing rate of population?
根據(jù)演講者所說(shuō),哪一類國(guó)家的人口增長(zhǎng)速度是最快的?
2. Under what circumstances would bring the lower or middle income countries(which can afford a bike) to the level of the emerging economies(which can afford a car) in 2050?