51. What does “that” in the third paragraph refer to?
(A) Some malaria parasites escaping from the ecosystems.
(B) Malaria parasites becoming immune to the engineered bacterium.
(C) Modified mosquitoes becoming more competitive than the wild ones.
(D) Transmission of malaria being blocked from mosquitoes to humans.
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文章前3段大意，是說科學家為了消滅瘧原蟲...
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題目翻譯及解析： 第 3 段中的 "t...
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