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Tina, a 10-lb 2-oz baby, was born into the Rodriguez home. The parents were delighted to have her, and she was given much love and attention. She seemed to grow up very normally, but did learn to talk a bit later than her two older siblings did. One day when she was about 3 years old, she fell off a swing and hurt her head, and had to have a few stitches to close a small wound. Several times after this the parents noticed that she would forget little things. It did not bother them until she enrolled in school, when she was 5 years and 10 months of age. At first she was anxious to go to school, but soon things began to change. She complained of being sick, and very often at school she had to use the restroom. The teacher complained that the child spent much of her time just gazing. She liked to talk to her friends, and often got into trouble with the teacher because she would not get her work done. Most times she completed no more than half an assignment. Her parents noted that she seemed to have lost her cheerfulness at home, and she often came home grumpy and complained that no one wanted to play with her. The longer she stayed in school, the worse her behavior became, and to top it all, in early spring the teacher concluded that Tina was not learning anything and was going to have to repeat the first grade. None of the following statements is true EXCEPT______.
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Making Light of SleepAll we have a clock located inside our brains. Similar to your bedside alarm clock, your internal clock runs on a 24-hour cycle. This cycle, called a circadian rhythm, helps control when you wake, when you eat and when you steep.Somewhere around puberty, something happens in the timing of the biological clock. The clock pushes forward, so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it"s time for bed, your body may be pushing you to stay up for several hours more. And the light coming from your computer screen or TV could be pushing you to stay up even later.This shift is natural for teenagers. But staying up very late and sleeping late can get your body"s clock out of sync with the cycle of light and dark. It can also make it hard to get out of bed in the morning and may bring other problems, too. Teenagers are put in a kind of a gray cloud when they don"t get enough sleep, says Mary Carskadon, a sleep researcher at Brown University in Providence, RI. It affects their mood and their ability to think and learn.But just like your alarm clock, your internal clock can be reset. In fact, it automatically resets itself every day. How By using the light it gets through your eyes.Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks. For years, researchers thought that the signals that synchronize the body"s clock were handled through the same pathways that we use to see.But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether it"s day or night. In the third paragraph the author wants to tell the reader that ______.
低压配电系统，系指1kV以下的交流系统，我国低压变配电系统接地形式，等效采用国际电工委员会(IEC)标准，即______三接地形式。
下面哪一种电压不是我国现行采用的供电电压______
某20层办公建筑，总建筑面积为12万m2，东西长200m，南北宽30m。每层设3个防火分区，每个防火分区贯通南北向。在建筑物的中部设有10kV配电所、10/0.4kV变电所和弱电控制中心、综合布线主设备间，在东部和西部各设有一个10/0.4kV变电所和综合布线分设备间，该建筑物配置完善的智能化系统。 该建筑物至少应设______电气间。
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