小明用自制的电路板错将两只额定电压相同的甲．乙两只白炽灯，串联后接入家庭电路，结果两只灯都不能正常发光，但甲灯比乙灯亮。则下列说法中正确的是（）

生活在这个伟大的时代，我们每个人都应该有自己的理想和抱负，而理想的实现需要我们在现实中努力。通向理想的道路只有一条，就是（ ）

（1）若（x²﹣1）+（x²+3x+2）i是纯虚数（i为虚数单位），求实数x的值；

（2）已知z的共轭复数为$\stackrel{-}{z}$，且(z+$\stackrel{-}{z}$)²=3z$\stackrel{-}{z}$$·$i=4-12i（i为虚数单位），求复数z．

    A new research on students' sleeping habits says that more than 70% of students do not get enough sleep.

    Researchers found that primary school students get 9 hours and 10 minutes of sleep a night, junior high school students get 8 hours and 6 minutes, and senior high school students get 7 hours and 9 minutes. None of those hours are enough for each group. Not enough sleep can cause many kinds of problems in children and teenagers.

    In 2007, Shanghai Municipal Education Commission asked primary and middle schools in the city to adjust their timetables so that students could get more sleep. Two years later, a research found that students at schools that adjusted their timetables got more sleep than in 2005.

    The researchers hope that the government will take measures to make students have enough sleep. Students in other places may even less sleep than those in Shanghai.