单项选择题
A．His poems are heavily influenced by French writers. B．His stories are mainly set in the State of Virginia. C．His work is difficult to read. D．His language is not refined.
A．Accurate communication is of utmost importance. B．Pilots should be able to speak several foreign languages. C．Air controllers should keep a close watch on the weather. D．Cooperation between pilots and air controllers is essential.
A．It can help people to become literate within a short time. B．It was originally designed for teaching the English language. C．It enables the learners to master a language within three months. D．It is effective in teaching any alphabetical language to Brazilians.