As the nights get longer， those who suffer from the winter blues（冬季忧郁症）will be planning ways to escape to the sunshine． But there may be a much simpler way of cheering yourself up----simply shining a bright light into your ear canal．
Up to one in four Britons suffer from seasonal affective disorder（SAD）， with seven percent of the population having full-blown SAD． It is caused by the brain not receiving enough daylight which is needed to trigger serotonin， a hormone（荷尔蒙）that controls mood． Symptoms（症状） range from mildly sleepy to depression and insomnia（失眠症）， but a cure might be in sight．
Two clinical experiments， run by Valkee who make a device that can shine light into your ear and the University of Oulu in Finland， have found that carefully targeted light can help prevent the condition．
Juuso Nissilä， Valkee's co-founder and chief scientist said： "We presented earlier that the human brain is sensitive to light． These two clinical experiments show that channeling bright light via the ear canal into brain's photosensitive areas effectively prevents and treats seasonal affective disorder．"
The University of Oulu reported that in their first study， 92 percent of the patients with seasonal affective disorder achieved full remission（缓解） after a month of daily 8 to12 minutes" doses （剂量）of light from the Valkee．
Timo Takala， chief physician at the Oulu Deaconess Institute said， "These clinical experiments show that bright light channeled into the brain via the ear canal is an important future method of treating seasonal affective disorder．"
Valkee launched its bright light headset in August 2010． It is classed as a medical device under EU regulations．
The device channels bright light direct to the brain via the ear canal to prevent and cure depression， mood swings and even circadian rhythm（昼夜节律） disorders such as jet lag（时差感）．
It costs £185 and looks like an iPod - only the earphones send out light rather than sound．
Anyone wanting to copy the effects with a flashlight is likely to be disappointed， it emits the wrong kind of light that is apparently too yellow．



What can be inferred from the first two paragraph？ ______

A. Light as well as sound is essential for curing SAD
B. Receiving enough daylight makes for a good mood
C. There's a long way to go for curing SAD thoroughly
D. The number of Britons having SAD continues growing

Which of the following is TRUE according to the passage？ ______

A. Shining a bright light into your ear canal is the only way to treat SAD
B. The device can help one to recover from all physical problems．
C. You might not suffer from jet lag if you wear a bright light headset
D. A flashlight can work exactly as the bright light headset

What can be the best title of the passage？ ______

A. The harmful effects caused by SAD
B. Keep the sunshine in your heart---enjoy a colorful life
C. The most efficient way to prevent and cure SAD
D. Shine a light in your ear---brighten your mood in winter