2. 医学
  3. If nothing is done to protect the environment, millions of species that are alive today will have become______.

If nothing is done to protect the environment, millions of species that are alive today will have become______.

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问题 If nothing is done to protect the environment, millions of species that are alive today will have become______.
选项 A、deteriorated
B、degenerated
C、suppressed
D、extinct
答案D
解析 extinct灭绝的，绝种的；熄灭了的。deteriorate使…恶化。degenerate衰退，退化。sup—press压制，镇压；禁止发表，抑制(感情等)。
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