9. The retina’s macula, while small in size, plays a disproportionately large role in vision because __________.
(A) it protects the optic nerve from infection
(B) it contains most of the rod cells responsible for motion detection
(C) it is the only part of the retina exposed to light
(D) it contains a dense concentration of photoreceptors crucial for detailed vision
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統計: A(1), B(3), C(0), D(7), E(0) #3430715
統計: A(1), B(3), C(0), D(7), E(0) #3430715