Vào năm 1832, phenol (C₆H₅OH) lần đầu tiên được tách ra từ nhựa than đá. Phenol rất độc, khi con người ăn phải thực phẩm có chứa phenol có thể bị ngộ độc cấp, tiêu chảy, rối loạn ý thức, thậm chí tử vong. Ở dạng lỏng, phenol không có khả năng phản ứng với

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  A _____________ punishment is necessary to prevent poaching and cutting trees illegally.
   

• Choose the best answer for the following sentence:

  ____________ passenger pigeon, one of several species of extinct birds, was hunted
  to extinction over _____________ few decades.
   

• Choose the best answer for the following sentence:

  Since the 1600s, humans have rapidly increased _____________ rate of extinction because of population growth and resource consumption.
   

• Choose the best answer for the following sentence:

  Today, most of ___________ world’s habitats are changing faster than most spe-cies can evolve, or adapt to such changes.
   

• Choose the best answer for the following sentence:

  We need ____________ actions and interventions of the local authorities to prevent national parks from being destroyed by pollution.
   

• Choose the best answer for the following sentence:

  There was no scientific evidence that the catastrophic _______________ in Britain’s song-birds was due to the unwelcome attention of birds of prey.
   

• Choose the best answer for the following sentence:

  ______________ weapons have made more contribution to poaching and killing wild animals.
   

• Choose the best answer for the following sentence:

  Poachers deserve strict ________________ for what damage they have caused to wildlife.
   

• Choose the best answer for the following sentence:

  ___________ you open the window, please? It is so hot in here.
   

• Choose the best answer for the following sentence:

  Family ______________ spend more time talking, instead of just watching TV.