A major cause of blindness in the industrialized
Collins Practice Test for IELTS 2 ANSWER KEY TEST 1 (ONE) ACADEMIC READING READING PASSAGE 3 (THREE) ANSWERS 27 B 28 E 29 D 30 C 31 F 32 A 33 cornea 34 macula 35 optic nerve 36 (industrialised) world 37 younger people 38 central vision 39 photoreceptor 40 injecting