该不该在课堂上用计算器?(1)
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科学60秒:安全驾驶需牢记
What do you do while driving to make the streets more dangerous? the radio? Light a cigarette? Butter your bagel while texting as you adjust the seat? Or possibly the most dangerous, do you simp
风雨中的雄鹰
短文Eagle in a Storm Did you know that an eagle knows when a storm is approaching long before it breaks? The eagle will fly to some high spot and wait for the winds to come. When the storm ...
绒线的颜色
短文You go to the local laundromat to do your wash.In the spinning barrel full of sudsy water you load clothes of all colors: a bright red tee-shirt, blue jeans, a green bandanna. The original mi
太阳能热水器 (1)
AfghanistanSolar water heaters are devices that use energy from the sun to heat water. Solar water heating is used around the world. The solar water heater described here is based on a design de...