Cover of the textbook Focus 4 (2nd edition) - Student's Book

The key answer of exercise 4

The key to exercise solutions in chapter 7.4 - Reading for the textbook Focus 4 (2nd edition) - Student's Book with authors Sue Kay, Vaughan Jones and Daniel Brawshaw from Pearson Education

Question

Read the texts again and answer the questions.

Answer

TEXT A

  1. In the digestive system.
  2. They cause disease.
  3. Because we all have different gut microbiomes.
  4. It affects the way individuals respond to drugs and in turn it is affected by e.g. antibiotics.

TEXT B

  1. Through dirty hands.
  2. It gets rid of the ‘good bacteria’ too.
  3. To avoid the risk of infection.
  4. The bacteria in its saliva may boost your immune system.

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