填空题

Natural gas trapped in underground reservoirs is extracted by ______.

【参考答案】

drilling wells into the earth
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填空题
People renewed their interest in natural gas as a fuel as a result of ______ of the late 1960s and early 1970s.
单项选择题
A．They strongly believe in family rules.B．They are very likely to succeed in life.C．They tend to take responsibility for themselves.D．They are in the habit of obeying their parents.
A．They strongly believe in family rules.
B．They are very likely to succeed in life.
C．They tend to take responsibility for themselves.
D．They are in the habit of obeying their parents.
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