【单选题】How many years will it be before the world runs out of oil? The question is far from an academic exercise. This year oil hit a near record high of $40 a barrel, and Royal Dutch/Shell Group downgraded ...
A.
How long the oil age will last is simply an academic question.
B.
The oil price this year set a new record.
C.
Shell Group reduced its reserves to 4.5 billion barrels this year.
D.
Economists disagree with one another on how much oil you can realistically mine.