TOEFL Reading: ETS-TOEFL阅读机经 - OMF642B01WKKY0V3L$

Paragraph 2 implies which of the following about the "early origin of eyes" A. They were able to detect simple movements almost from the beginning of their evolution. B. They were not as sensitive to light as once thought. C. They could not form images. D. Their cells had more photosensitive pigment than do human eyes.