Eating a diet of French fries, Pringles and white bread was enough to make one teenage boy lose his sight, according to a case study published in a medical journal. Scientists from the University of Bristol examined the case of a young patient whose extremely picky eating led to blindness, and have warned of the dangers of a poor diet.

The boy patient told doctors he had only eaten fries from the fish and chip shop, Pringles potato chips, white bread, slices of processed ham and sausage since primary school. He first visited a doctor at age 14, complaining of tiredness. He wasn’t taking any medicine, had a normal BMI and height, and showed no visible signs of malnutrition. Doctors discovered low vitamin B12 levels and anemia, treating the patient with vitamin B12 injections and advising him to have a healthy diet.

One year later there were signs of hearing loss and decreased vision symptoms, but doctors did not find the cause. The patient’s extreme diet led to nutritional optic neuropathy. He couldn’t see by 17 years of age, and doctors found vitamin B12 deficiency, low copper and selenium levels, a high zinc level, reduced vitamin D level and bone level density, according to a statement from the University of Bristol. By this stage, vision damage could not be recovered.

Researchers from Bristol Medical School and the Bristol Eye Hospital examined the case and concluded that the patient suffered nutritional optic neuropathy. In developed countries it is rarely caused entirely by poor diet because food is easy to get.

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1.The boy patient would not eat _________ according to the passage.

A French fries

B Pringles potato chips

C a lot of vegetables

D slices of processed ham

解析：选C。细节理解题。由第二段第一句“他从小学开始就只吃炸鱼薯条、品客薯片、白面包、加工过的火腿和香肠片”可知他没有吃大量的蔬菜，故选C。

2.What did the doctor find when the boy first went to see a doctor? ①A normal BMI and height. ②Low copper and selenium levels. ③Low vitamin B12 levels and anemia. ④No visible signs of malnutrition.

A ①②③

B ①③④

C ②③④

D ①②④

解析：选B。细节理解题。由第二段可知男孩14岁第一次去看医生，医生发现他身体质量指数和身高正常，没有明显的营养不良迹象，体内维生素B12水平较低、贫血，并没有发现铜和硒含量低，②表述错误，故选B。

3.When did the boy completely lose his sight?

A At the age of 14.

B At the age of 15.

C At the age of 16.

D At the age of 17.

解析：选D。细节理解题。由第三段He couldn’t see by 17 years of age他17岁时就失明了，可知，选D。

4.The passage mainly tells us that __________.

A a boy suffered nutritional optic neuropathy

B a boy only ate Pringles, white bread and French fries since primary school

C nutritional optic neuropathy is rarely caused entirely by poor diet in developed countries

D a boy became blind after only eating Pringles, white bread and French fries for many years

解析：选D。主旨大意题。通读全文，文章介绍了一个男孩多年来只吃品客薯片、白面包和炸薯条，导致17岁就失明了，故选D。