Question

review the details below.
frequently hand washing with warm water and soap is the best way to get rid of
germs and prevent illnesses.
used sponges and rags should be replaced regularly to avoid spreading harmful
bacteria.
moderate exercise boosts the immune system and can reduce the risk of colds by a
third.
choose the best topic sentence to introduce a paragraph containing these details.
simple steps can reduce the likelihood of spreading or catching an infectious
illness.
the best way to prevent illnesses is to maintain a healthy immune system.
it is possible to reduce the risk of colds and flus by washing your hands and
working out several times a week.

Explanation:

The task is to create a topic sentence for a paragraph about preventing illnesses. The key details include hand - washing, immune system maintenance (through exercise and healthy habits), and hygiene practices (like replacing sponges). A topic sentence should encapsulate these main preventive measures.

Answer:

Simple steps such as regular hand - washing, maintaining a healthy immune system through moderate exercise, and proper hygiene (like replacing used sponges) can reduce the likelihood of catching or spreading infectious illnesses.