单项选择题
A．In areas with few weeds and unwanted plants. B．In areas with a severe shortage of water. C．In areas lacking in chemical fertilizer. D．In areas dependent on imported food.
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．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.