Saturday, February 25th

    The Turn off (关掉) TV Week starts today. People who organize (组织) it say that TV is a bad thing. I' m not sure if they're 1 .

First of all, the organizers say that children today are in bad physical condition (身体状况) because they 2 almost all their free time in front of the TV. But a 3 of 10,000 American children aged 10 to 15 found no connection (联系,) between TV and physical health. Children who don't watch TV don't always do more 4 .

    Of course, there are some terrible programs on TV. 5 I don't think we should say no to TV. We 6 need to choose programs good for us ourselves. Another 7 that the organizers agree on （同意) is that TV stops us from talking with others. An American study found that parents in homes with no TV had an hour of talk with 8 children every day. In other homes, there was only 38 minutes of talk …… a week! That's bad. But TV can also bring people together and 9 to start a talk. Is there a better way to start a talk than by talking about, the latest popular programs?

    Turn off my TV? OK. But I also10 to turn it on when there's something good on.

 在探究电流通过导体时产生热的多少与什么因素有关时，采用了如图所示的实验装置．这是用来探究电流通过电阻丝产生的热量与（　　）

沿海地区同沙漠地区相比，冬暖夏凉，昼夜温差小。这是因为(    )

 (a+2x+3x²)(1+x)⁵的展开式中一次项的系数为 -3 ,则 x⁵ 的系数为____