阅读理解
    According to a recent survey, British teenagers are not in good health because they don't have enough time for sleep. They don't sleep well, either. They are often disturbed(打扰) by electronic gadgets(器具，装置) in their bedrooms. We call such kind of sleep “junk sleep”.
    We did a survey among 1,000 students aged 12 to 16, and we found out that 30 percent of them slept for only 4 to 7 hours a day. Nearly a quarter said they fell asleep while they were watching TV, listening to music or using other electronic gadgets.'
    Nowadays, almost all the teenagers have a phone, music system or TV in his or her bedroom. Almost 20 percent of the teenager boys said the quality of their sleep were not good. It was affected by leaving their TVs or computers on. The survey also found out that 40 percent of young people felt tired every day. What's more, the girls aged 15 to 16 felt the worst among them.
    “Teenagers need to realize the importance of sleeping well. If they sleep well, they will be able to study hard and perform well at school. I am shocked to know that so few teenagers have noticed the close connection between sleep and schoolwork,” said Dr Chris.

中国改变工业落后的面貌，开始向社会主义工业化迈进的标志性事件是（    ）

如图所示，电路两端的电压保持不变，当滑动变阻器的滑动触头P向右移动时，三个灯泡亮度的变化情况是（    ）

解不等式组 $\{\begin{array}{c}2\left(x-2\right)\le 3x-3\\ \frac{x}{3}<\frac{x+1}{4}\end{array}$ 并写出它的所有非负整数解．

我国是互联网大国，网民人数已超过5亿。随着互联网的快速发展，网络谣言也在滋生蔓延，既有针对个人的诽谤，也有对公共事件的捏造，如不依法加强管理，将危害社会稳定和经济发展。H7N9禽流感疫情和四川地震发生后，国家相关部门果断出击，一批网络谣言的制造者、传播者被依法拘留或教育训诫。