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[单选题]
By the time the fire engines arrived, the tall building ______ to the ground.(1分)
A
had been burned
B
was burned
C
has been burned
D
would have been burned
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A
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1.The sun sends out huge amounts of energy, not only to Earth, but to all other planets in the solar system and directly into space. The source of all that energy is nuclear fusion (核聚变) occurring at the sun’s core. The Large Helical Device being developed at the Ministry of Educational Institute for Fusion Science (NIFS) is essentially an “artificial sun” that aims to reproduce this nuclear fusion on Earth.“Nuclear fusion is a reaction in which nuclei of light atoms such as hydrogen combine to form nuclei of heavier atoms such as helium (氦). If we can utilize the huge amounts of energy released by this reaction, nuclear fusion will then constitute a completely new, clean and never ending source of energy,” says NIFS Director Atsui Iiyoshl. In many respects, fusion is far superior to the various conventional energy sources currently in use.Fusion seems to have tremendous potential as a new source of energy. But to produce fusion reactions on Earth, it is necessary to meet a set of critical plasmatic (等离子区) conditions, including ultra-high temperatures of 100 million degrees or so centigrade - a state that refuses to imagine. To meet this challenge, Japanese scientists have come up with their own unique helical device that is particularly safe and is suitable for continuous operation.The large Helical Device now being developed is expected to be completed by the end of next year, with experiments scheduled to start at the beginning of 1998.(5分)1.1The phrase “artificial sun” in the first paragraph probably means “________”.(1分)A. a man-made sun B. NIFSC. the sun’s energyD. fusion science
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Passage FiveMark Twain is one of America' s much-be loved authors， creating imaginative and humorous classics for children and adults alike， such as The Adventures of Tom Sawyer， The Prince and The Pauper, and Adventures of Huckleberry Finn. Twain passed away in 1910， leaving behind a treasure of great literature. But now， 100 years after his death，he' 11 have a brand-new book on the shelves: a three-vol umeautobiography.Twain hasn' t been keeping busy in his tomb it was his wish that publishers wait until .100 years after his death to publish his memoirs ) which he spent the last decade of his life working on.The autobiography totals more than 5, 000 pages， and likely won' t be all sunshine and roses. It seems that Twain harbored some bitterness against former girlfriends and ex- friends. He also writes negatively about politicians of his day， such as Teddy Roosevelt.It' s likely that he requested such a long lead time for the memoirs because he didn' t want to hurt the feelings of anyone ment ioned in this work.Although small sections of the memoirs have been prev ious ly published the autobiography has never been available in full， and should provide great insights into the man behind the classic books.The first volume of the set will be available in November， and the trilogy is being published by the University of California, Berkeley."There are so many biographies of Twain, and many of them have used bits and pieces of the autobiography' ，editor Robert Hirst told The Independent. "But biographers pick and choose what bits to quote.By publishing Twain' s book in full we hope that people will be able to come to their own complete conclusions about what sort of a man he was.
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简述我国传统科技的民族文化基础。
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