[简答题]地图配对 gas

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[简答题]地图配对 现在订票9.50

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[简答题]地图配对 urban garden旁边一个什么，选 E

[简答题]地图配对 lake旁边一个什么garden,选D

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[单项选择]Natural Gas Natural gas is produced from reservoirs deep beneath the earth’s surface. It is a fossil fuel, meaning that it is derived from organic material buried in the earth millions of years ago. The main component of natural gas is methane. The popularity and use of clean natural gas has increased dramatically over the past 50 years as pipeline infrastructure has been installed to deliver it conveniently and economically to millions of residential, commercial and industrial customers worldwide. Today, natural gas service is available in all 50 states, and is the leading energy choice for fueling American homes and industries. More than 65 million American homes use natural gas. In fact, natural gas is the most economical source for home energy needs, costing one-third as much as electricity. In addition to heating homes, much of the gas used in the United States is used as a raw material to manufacture a wide variety of products, from paint, to fibers for clothing, to plastics f

[填空题]A Popularity and use of natural gas
B Natural gas reserves and supply
C Natural gas prices
D Clean fuel of choice
E Disadvantages of natural gas
F Natural gas consumption
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[单项选择] 配对设计是
A. 把两个条件一致的受试对象配成一对
B. 把几个条件一致的受试对象配成一个配伍组
C. 将受试对象完全随机分配到各处理组中进行实验观察
D. 要求对照组与实验组之间具有良好的均衡性
E. 有良好均衡性的组配成对了