单选题 .  In any comprehension text you will find words that you don't know, You can     1    them up in a dictionary., of course,     2    it is a good idea to get     3    the habit of using a dictionary as     4    as possible, particularly if you are preparing     5    an examination. In fact, if you read the text     6    and think, it is usually possible to guess the     7    of most words that you don't know. Look     8    the context of each word—the sentence that it is     9    , and the sentences that come before and after. Look to see     10    the word is repeated     11    in the text; the more often it is     12    , the easier it is to understand.
    Some words     13    be guessed from looking at their     14    . But don't expect to be able to guess     15    of the new words in a text. There will be     16    that you can only get a general     17    of, and a few will be impossible. Don't     18    too much time worrying about these: the most     19    thing is to understand the text as a (an)     20    as well as possible, and one or two difficult words will not usually make much difference.1.