单项选择题

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单项选择题
C
单项选择题
A. An alternative use of fuel oil.B. A way to make fuel oil less polluting.C. A new method for locating underground oil.D. A new source of fuel oil.
A. An alternative use of fuel oil.
B. A way to make fuel oil less polluting.
C. A new method for locating underground oil.
D. A new source of fuel oil.
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