问题:
[单选题]When we stare at the starry night, it is easier to find a star when we look from the corner of our eyes. This is because…
A There are more rod cells on the peripheral area of retina.
B There are more cone cells on the peripheral area of retina.
C There are less rod cells on the peripheral area of retina.
D There are more rod cells on the central area of retina.
答案解析: