12．（61）Spending （spend） too much time online can increase your risk of catching（62）a cold or flu，scientists have warned．
Those with greater levels of Internet addiction are （63）more likely （likely） to give in to illness than those who spend fewer hours online．
Researchers believe the reason lies（64）in the fact that people with an Internet addiction are more lonely，and as a result have（65）weakened/weaker （weak） immune（免疫）systems．
They said the lack of interaction with other people and less time spent outside exposing（66）themselves （them） to germs（細(xì)菌）played a role．
Also，recent studies（67）have found （find） people who spend more time online experience greater sleep problem，have（68）worse（bad） eating habits，do less exercise and tend to smoke and drink more alcohol．
These（69）behavio（u）rsbehave） can harm their immune system and increase chances of getting diseases．
Professor Phil Read said，We found that the impact of the Internet on people's health was independent of other factors，like depression，sleep problem，and loneliness，（70）whichare associated with high levels of Internet use and also with poor health．
