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  1. tahasozgen's Avatar
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    #1

    (sentence completion) Scientists are still not certain why people need sleep

    Hi There;
    I want to ask a question about completion of sentence. Question is below:

    Scientists are still not certain why people need sleep, ____

    A)as it can be extremely difficult for most people to do their daily activity without sufficient sleep.
    B)yet it influences almost every aspects of our lives, from our mood to the functions of our organs.
    C)though lots of people experience imsomnia and they do not know its causes.
    D)so neuroscientists and biologists are investigating ways to improve the quality of sleep.
    E)whereas people who travel long distances generally suffer from lack of sleep.
    We believe answer is A, however key depicts B. Could you please explain?

    Thanks in advance.

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    #2

    Re: (sentence completion) Scientists are still not certain why people need sleep

    The first clause says scientists don't know why people need sleep. Answer A begins with as. If you complete the sentence with A, it means that scientists are uncertain because people need sleep.

    Does that seem logical?
    I am not a teacher.

  2. tahasozgen's Avatar
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    #3

    Re: (sentence completion) Scientists are still not certain why people need sleep

    In general terms, of course scientists know why people need sleep. However, since the subject is "scientist", scientists may not know the biochemical mechanics of sleep. Are we wrong?

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    #4

    Re: (sentence completion) Scientists are still not certain why people need sleep

    Quote Originally Posted by tahasozgen View Post
    In general terms, of course scientists know why people need sleep. However, since the subject is "scientist", scientists may not know the biochemical mechanics of sleep. Are we wrong?
    You understand the first clause correctly. It's the logic of answer A that's faulty. The resulting sentence would be Scientists are still not certain why people need sleep, as it can be extremely difficult for most people to do their daily activity without sufficient sleep. Simplifying this and changing as to because, you'd get something like Scientists don't know why people need sleep because it's hard for people to function without enough sleep.

    The second clause does not follow from the first, so answer A is wrong.
    I am not a teacher.

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