Dear Sir,

As an elementary school teacher and mother of two, I thought your recent article on children and TV was very interesting. However, my views on the subject __51__ those of the writer.

For years, newspaper columnists and other so-called experts have criticized TV programs. Often, they don't think about television as a __52__ learning too1. I've used TV in my classroom for years, and it has helped make learning a much more interesting experience for my young students.

In my view, TV can be anti-violence and pro-learning. When used in the right way, it can even __53__ the learning process. I use TV programs to teach geography, science, and even reading - and my students' higher test scores prove that this strategy is __54__. Both my children grew up watching TV shows like Sesame Street and they are now among the top

students in their school. These types of programs help students learn basic __55__ skills like the alphabet, and how to count. They can also teach children things like sharing and environmental awareness.

I think it's time to stop criticizing TV, and focus on its amazing potential for practical and constructive learning.

Many doctors and scientists believe that there are different causes for the different forms of cancer. Working conditions may __51__ cancer. For example, people who work in __52__ contact with chemical compounds like arsenic or asbestos may develop cancer. People who work for long periods of time with X-rays or radioactive material may get leukemia or cancer of the skin, bone or lungs. Smoking is __53__ cause of cancer. Many experiments have shown that smoking can produce lung cancer as well as cancer of the mouth, larynx and esophagus. __54__, viruses may cause cancer. Scientific research has shown that viruses bring about certain kinds of cancer in laboratory animals. Scientists are now trying to find out __55__ true for humans as well. Although we don，t have the answer yet, perhaps in the near future we will know what causes this disease.