_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.


  1. A.
    While
  2. B.
    When
  3. C.
    Since
  4. D.
    if only
A
試題分析：考查連詞：A. While雖然,B. When當(dāng)…時候，C. Since既然D. if only 但愿，句意：雖然克隆人類胚胎是違法的，但一些科學(xué)家已經(jīng)在努力推進(jìn)研究為了制造克隆的人類嬰兒。選A。
考點(diǎn)：考查連詞
點(diǎn)評：考查連詞主要是弄清每個冠詞本身的含義，做題時一定要根據(jù)上下文的邏輯關(guān)系選擇。
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