阅读下面的材料，从每题中所给的A、B、C三个选项中，选出最佳选项回答问题或完成句子。

Recently, a study (研究), published in BMC Medicine, found that sitting in front of the TV for a long time was a risk for people’s health.

After scientists used data (数据) on 370, 000 people, covering 12 years, they found about 9, 000 developed heart disease. They found people with genes (基因) of heart problems were more likely to develop heart disease. However, they found that people without such genes watching more than four hours of TV every day were also at the greatest risk of heart disease. People spending 2 to 3 hours a day watching TV had a 6% lower risk. And those who watched less than an hour had a 16% lower risk. The scientists of the research team finally found cutting TV watching time to less than an hour a day could prevent 10% of heart disease.

In life, people who want “one more episode (剧集)” might be the group at a higher risk, for they are easy to spend more time watching TV. If they have more snacks while watching TV, it might add the risk of putting their hearts in danger. So, if people want to watch TV longer, standing up and moving the body, or hanging out will work. But limiting their time on TV could be a more useful way to help them avoid possible heart problems in the future.

（1）According to the text, how long did the research cover?

A．

10 years.

B．

12 years.

C．

14 years.

（2）From paragraph 2, which of the following is right?

A．	People watching one hour of TV are at the greatest risk.
B．	The less time people spend on TV, the lower the risk is.
C．	Watching TV is the only reason to develop heart disease.

（3）Which best explains “limiting” underlined in paragraph 3?

A．

限制

B．

记录

C．

花费

（4）Where is this text probably from?

A．

A tour guide.

B．

A story book.

C．

A newspaper.

（5）What is the main idea of the text?

A．	We’d better not watch TV more than one hour a day.
B．	Hanging out after dinner is good for our heart health.
C．	Having snacks while watching TV adds risks for heart.