26.

  1. The prevention of illness.
  2. A new kind of insect repellent.
  3. Poisonous chemicals in the new product.
  4. The importance of taking vitamins.

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27.

  1. A farmer.
  2. A researcher.
  3. A pharmaceutical firm.
  4. A weapon-making company.

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28.

  1. Body temperature.
  2. Vitamins.
  3. More meat on the skin.
  4. Certain human odors.

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29.

  1. It is the cheapest.
  2. It is less dangerous and easier.
  3. It is faster.
  4. It is the most effective.

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30.

  1. It does not require a doctor.
  2. It can be used by young and old people alike.
  3. It can be taken as often as needed.
  4. It uses natural ingredients.

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The news is in: we have another weapon against mosquitoes. Researchers in a pharmaceutical firm in Long Beach, California have discovered a way to keep these irritating pests away. And it's just a pill the size of an ordinary vitamin, no toxic chemical ingredients and of course no need for shots.

In the past, most people have used chemicals sprays to keep these insects from biting. Yet, some people are allergic to the chemicals, and researchers have found that constant exposure to the fumes may cause damage to a person's health. An alternative to keep these insects away is to give a shot, or spray, but these methods are costly and painful to some.

The researchers argue that this method involves no risk to the body, since the pills contain only natural ingredients. They only require purchasing the pills at a local drugstore and taking one when needed, and they last four hours. Mosquitoes are attracted to higher body temperatures, fleshier skin, and certain human smells. The new pill causes the body to release an odor that repels mosquitoes. Unlike chemical sprays, however, that have odors perceptible to humans, the odor released by the pill cannot be detected by anyone, except the annoying pest itself. The odor released by the body is a natural odor that the body produces automatically when exposed to certain nutrients.