Work has begun on the c _______ of the new airport.
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【单选题】There are studies indicating female with four different photopigments in a certain kind of cells have better color sensitivity than those with three different photopigments. What type of cell has the ...
【判断题】Each eye has approximately six million retinal cone cells. They are packed much more tightly in the center of our visual field a small region called the fovea than they are at the edges of the retina.