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减轻焦虑: _______________
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Direction:Complete each unfinished sentence with a word, phrase, or structure from the box in the proper form.can be traced to, not, fascinating, of all the disasters, historically speaking, proves, made a name for himself, puzzled, most likely, well worth, no1.China is certainly a ________ place to visit and to get to know because it is a country with a past of rich traditions, a present of rapid growth and changes and a future as bright as any other nation in the world.2.________ person who likes to drink tea or coffee, cocoa or cola drinks, is ________ a consumer of caffeine because the drug is found in all these non-alcoholic drinks.3.Why tooth decay and uneven teeth growth develop so quickly among some children in a big city has ________ many a doctor for a long time.4.As smoking is mainly psychological, anything that you can find to take your mind off your cigarettes ________ to be one of the remarkable methods to quit smoking.5.That young teacher has recently _______ as co-author of a scholarly article about Teaching English as a Second Language.6.________ that can do great harm to human beings, the one ________ to happen is the large-scale nuclear fission.7.The United States is known for jazz, a completely original type of music that has gained worldwide popularity. But _______, the origin of this music is as interesting as the music itself, so it is ________ finding the time to learn about its development. One of the brilliant men who was so much better than anyone else was called a jazz immortal. His rise to fame ________ to his love for the people.
在反应 BF3 ＋ NH3 ＝ BF3·NH3 中， BF3 为
根据酸碱质子理论，下列分子或离子是酸的物种为HS－ CO32－ H2PO4－ NH3 H2S NO2－ HCl CH3COO－ OH－ H2O
根据酸碱质子理论，下列分子或离子在水溶液中既是酸又是碱的物种为HS－ CO32－ H2PO4－ NH3 H2S NO2－ HCl CH3COO－ OH－ H2O
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