2. 外语
  3. Now let us look at how we read. When we read a printed text, our eyes move cross a page in short, jerky movement. We recognize

Now let us look at how we read. When we read a printed text, our eyes move cross a page in short, jerky movement. We recognize

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问题     Now let us look at how we read. When we read a printed text, our eyes
move cross a page in short, jerky movement. We recognize words usually 1. ______
when our eyes are still when they fixate. Each time they fixate, we see a
group of words. This is known as the recognition span or the visual span.
The length of time in which the eyes stop — the duration of the fixation — 2. ______
varies considerably from person to person. It also varies within any one
person according to his purpose in reading and his familiarity with the text.
However, it can be affected by such factors as lighting and tiredness. 3,______
    Unfortunately, in the past, many reading improvement courses
concentrated too much on how our eyes move across the printed page. As 4.______
a result of this misleading emphasis on the pure visual aspects of reading, 5.______
numerous exercises have been devised to train the eyes to see more words
at one fixation. For instance, in some exercises, words are flashed on to a
screen for, say, a tenth or twentieth of a second. One of the exercises has 6.______
requested students to fix their eyes on some central point, taking in the 7.______
words on either side. Such word patterns are often constructed in the shape
of rather steep pyramids so the reader takes in more and more words at
each continuous fixation. 8. ______
    All these exercises are very clever, however it’s one thing to improve a 9.______
person’s ability to see words and quite another thing to improve his ability
to read a text effectively. Reading requires the ability to understand the 10.______
relationship between words.  
选项
答案∧concentrated—have
解析 本题为时态误用。虽然此句有时间状语in the past，但强调的是至今为止的情况，这在下文have been devised有所提示。
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