The little boy came riding full speed down the motorway on his bicycle. ______ it was! A. What a dangerous scene B. What dangerous a scene C. How a dangerous scene D. How dangero
Have you ever wondered how a turtle got its shell? You're not the only one. Paleontologists (古生物学者) have long been confused by the question. But a recently found turtle fossil (化石), t
Meeting people from another culture can be difficult. From the beginning, people may send the wrong signal. Or they may pay no attention to signals from another person who is trying to develop a re
(2x)4(xlgx)4＝1 120，x4(1＋lgx)＝1，所以x＝1，或lgx＝－1，x＝
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