单项选择题A．The study of Emu oilB．the use of Emu oilC．The effect of Emu oilD．neither of above choices

单项选择题A．the rapid growth in world oil consumptionB．the rise of China and IndiaC．the construction of new pipelines is becoming more difficultD．the rise of oil price

单项选择题A．In 1868B．In 1886C．In 1898D．In 1889

单项选择题A．Revolutionary WarB．the First World WarC．wars involved AmericaD．the Civil War

单项选择题What is not the element in defining language