单项选择题

Questions 21-25 are based on the following passage. In order to learn a foreign language well, it is necessary to overcome the fear of making mistakes. If the primary goal of language use is communication, the mistakes are secondary consideration that may be dealt with gradually as awareness of those mistakes increases. On the other hand, students should not ignore their mistakes. (88) The language learner may observe how native speakers express themselves, and how native expressions differ from the way the learner might say them. For example, a Spanish speaker who has been saying “1 do it” to express willingness to do something in the immediate future, could, by interacting with native speakers of English, observe that native speakers actually say “I’ ll do it”. The resulting discrepancy can serve as a basis for the student to modify his way of using the present tense in English. But a student who is unwilling to interact in the first place would lose this opportunity to learn by trial and error. The author’s major conclusion about the function of mistakes in foreign language learning is that .