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Why does the World Health Organization g
题目内容:
[单选题]Why does the World Health Organization give help to national governments to wipe out malaria?
A. The author does not give any reason in the whole passage.
B. Local governments are not skillful enough to kill mosquitoes.
C. Current sprays are not powerful enough to kill mosquitoes.
D. No new poisons have been developed to kill mosquitoes so far.
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