单项选择题

When manufacturing many different products，people commonly use natural gas（）．

A．over the past 50 years
B．beneath the earth’s surface
C．by more than 50 percent
D．for more than four decades
E．as a raw material
F．for home energy needs

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单项选择题

Paragraph 3（）

A．Clean fuel of choice
B．Natural gas prices
C．Natural gas consumption
D．Popularity and use of natural gas
E．Disadvantages of natural gas
F．Natural gas reserves and supply

单项选择题

Natural gas is recognized as the most economical energy source（）．

A．over the past 50 years
B．beneath the earth’s surface
C．by more than 50 percent
D．for more than four decades
E．as a raw material
F．for home energy needs