阅读理解。 Once Lu Xun spoke to the young men about the study of foreign languages. He said: 'You must not give up studying foreign languages for even a day. To master a language, words and grammatical rules are not enough. You must do a lot of reading. Take a book and force yourself to read it. At the same time, turn to dictionaries and memorize grammatical rules. After reading a book, it's only natural that you won't understand it all. Never mind. Put it aside, and start another one. In a few months or half a year, go over the first book again; you are sure to understand much more than before... Young people have good memories. If you memorize a few words every day and keep on reading all the time, in four or five years, you will certainly be able to read works in the foreign language.' 1. In order to master a foreign language, words and grammatical rules are ______. [     ] A. the most important thing B. necessary C. all we should remember D. almost enough 2. If you can't understand it all when you read a book, you should ______. [     ] A. start with its beginning again B. look up the new words in your dictionary and recite them C. start another one and go over the first one later D. stop to learn the grammatical rules in the book 3. What's Lu Xun's advice on how to learn foreign languages? [     ] A. Memorize as many new words as you can when you are young. B. Keep on reading all the time. C. Force yourself to read a book until you can understand it all. D. Never give up reading and try to remember new words in reading books. 4. This passage mainly tells us how to ______. [     ] A. do our reading B. turn to dictionaries C. memorize new words D. use grammatical rules