题目

阅读下面材料，阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。 Spending more than an hour on your smart phone each day may be a sign that you are suffering from depression,new study has suggested. The more time is spent (use) a phone for any reason including texting and going online, the more likely volunteers werehave the blues. Monitoring people's comings and(go) using GPS tracking on their phones also helped track mood. Spending most of your time at home was also (link) to depression, as was having an/a (regular) daily sched柴油机的效率为40%，用这台柴油机工作时，完全燃烧2千克的柴油可做有用功 焦．（柴油的燃烧值3.3×107焦/千克）