Question

select the correct sentence in the passage.
read the whole paragraph. then click on the main idea.
many people think they look better with a tan. but is a tan really healthy? tanning results from exposure to the sun. too much exposure can burn and peel the skin. even a little contact over months or years is dangerous. people who spend a lot of time in the sun increase their risk of skin damage. they are also more likely to get skin cancer. at its worst, skin cancer can kill. it can take years for skin cancer to develop. for this reason, you should begin to protect yourself and your family now. keep covered in the sun. use sunscreen with a sun protection factor (spf) of at least 15 on any bare skin. you can avoid the risk of skin damage and cancer if you protect yourself while in the sun.

Explanation:

The passage is about the health risks of tanning (sun exposure), including skin damage and cancer, and advice on protection. The main idea - introducing the danger of tanning - is likely in the sentence "But is a tan really healthy? Tanning results from exposure to the sun. Too much exposure can burn and peel the skin." (or similar key introductory sentence about tanning's harm). Since the task is to select the sentence with the main idea, we analyze the passage's focus: it starts by questioning if a tan is healthy, then explains sun exposure's risks. So the sentence introducing the topic of tanning's danger (like the one about tanning from sun exposure and its harms) is the main - idea sentence.

Answer:

The sentence "But is a tan really healthy? Tanning results from exposure to the sun. Too much exposure can burn and peel the skin." (or the relevant sentence that introduces the main topic of tanning's health risks)