题目内容
I have little doubt about his competence; ______ he is well-qualified for the job.
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The quantum theory states ______, such as light, is given off and absorbed in tiny definite units called quanta or protons.
______ to space travelers is high acceleration or deceleration forces.
______ these questions may sound academic, answers to them could have profound economic and political significance.
A body weighs ______ from the surface of the Earth.
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