Coal, oil, natural gas, and all other fuels are stored energy from the sun. Some was collected by this season's plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun falls as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun's outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun's entire output of radiant energy.
The sun is the source of all of the following EXCEPT______.
A.gasoline
B.natural gas
C.atomic power
D.animal fat
There are five pairs ______, but I am at a loss ________. |
[ ] |
A. to choose from, what to buy B. to choose, which to buy C. to choose from, which to buy D. to be chosen, which to buy |
B.图层就像是含有文字或图形等元素的胶片,一张张按顺序叠放在一起,组合起来形成页面的最终效果。图层可以将页面上的元素精确定位。图层中可以加入文本、图片、表格、插件,也可以在里面再嵌套图层。
C.在单独的图层中创建形状。可以使用形状工具或钢笔工具来创建形状图层。因为可以方便地移动、对齐、分布形状图层以及调整其大小,所以形状图层非常适于为Web页创建图形。
D.在photoshp里每个图片都要建立在单独的图层上,方便修改而不会改变其他的背景图片,有点像一张背景图上,每次再画点图案都要先铺上一张透明得纸吧,即可以显示整体效果又不会破坏背景图片。
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