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
Paragraph 3______

【参考答案】

D
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填空题
Natural gas is recognized as the most economical energy source______.
单项选择题
Which of the following is closest in meaning to the word sparked appearing in paragraph 2
A．flashed
B．stimulated
C．changed
D．ended
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