2. 外语
  3. Have you ever heard the color blue? Or tasted the musical note F-sharp? For most people, in both cases the answer is "no". But

Have you ever heard the color blue? Or tasted the musical note F-sharp? For most people, in both cases the answer is "no". But

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问题     Have you ever heard the color blue? Or tasted the musical note F-sharp?
For most people, in both cases the answer is "no". But for some people blue has a
particular sound or shape, and F-sharp has a slight sour taste. This unusual blending 【M1】______
of the senses is called "synesthesia" , a rarely neurological phenomenon occurring in 【M2】______
roughly 1 in 100, 000 People.
    People with this condition do not merely associate sound with color
or taste with sound, or imagine hear a sound when they see a certain 【M3】______
color. Rather, when a person with synesthesia encounters a particular sensory
stimulus, and says seeing the color red, they will hear a sound even that there 【M4】______
is no outside source producing the sound. In a similar manner, a particular
sound may cause someone with synesthesia to see certain shape or certain 【M5】______
colors, even when there is no object in that person’s line of sight. The same
goes for taste and smell.
    Scientists know very little about what causes synesthesia, while it appears
to be hereditary, the actual neurological processes that account with the 【M6】______
phenomenon remain a mystery. Although most scientists agree that the
hippocampus, an area of the brain responsible for memory, plays a role, but 【M7】______
exactly how the hippocampus might cause synesthesia is not clear.
Otherwise, scientific knowledge about synesthesia is limited to several
interesting observation. For example, synesthetic perceptions remain 【M8】______
consistent over time. In other words, if a person with synesthesia sees blue 【M9】______
and green flashes when he hears a C-sharp, he will always see those same 【M10】______
colors upon hearing that note.
【M8】
选项
答案observation--observations
解析 (原句中observation前使用的是several interesting，同时observation为可数名词，应使用其复数形式。)
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