选择题：An English dictionary is the most important thing

An English dictionary is the most important thing you will need when learning English. A good dictionary will help you learn hundreds of new words, improve your pronunciation and grammar.
When you think of a dictionary, you usually think of a bilingual dictionary, such as an English-German dictionary and a French-English dictionary. There is also another kind of dictionary: an English-English (monolingual) dictionary. Such a dictionary is written only in English. English words are defined or explained in English. English-English dictionaries are better than bilingual dictionaries in that English definitions are real English phrases with grammar and words.
There are two kinds of English-English dictionaries: dictionaries for learners and dictionaries for native speakers. Dictionaries for native speakers are used by Americans, Britons, etc. to look up very difficult words, such as tintinnabulation. Dictionaries for learners are used by people who are learning English as a second language. Dictionaries for native speakers usually have more words than dictionaries for learners, but the definitions are more complicated, and there are fewer example sentences.
If possible, get a software dictionary instead of a paper one. Software dictionaries let you look up words very quickly. What's more, a computer dictionary has more space than a paper one, so it can gi