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| Question : (1) During one exhibition,however,some air became mixed with the hydrogen,and in the words of the shaken performer:"The explosion was so dreadful that I imagined all my teeth had been blown out!" An entertainer would finished his acts by blowing the hydrogen he had inhaled towards a lighted candle;as the hydrogen caught fire,flames would shoot menacingly from his lips. A paper bag filled with hydrogen amazed guests by zooming off into space. When people learned about its unique lighter-than-air property,they began to use it in all sorts of parlour stunts. | |
| A | A. DCBA |
| B | B. DBAC |
| C | C. CABD |
| D | D. ACBD |
| Answer:A | |
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Tuesday, 3 May 2011
(1) During one exhibition,however,some air became mixed with the hydrogen,and in the words of the sh
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