Studying carefully the clues in the passage, we learn that the total population of Africa is ______. The author implies that th

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问题 Studying carefully the clues in the passage, we learn that the total population of Africa is ______.
The author implies that this world plan is to ______.

选项 A、be carried in ten years.
B、be realized in ten years
C、be drawn up by Parisian experts
D、be debated at an international conference