下列说法正确的是
A. 某物质其酸性越强则其共轭碱的碱性越弱
B. 某物质其Ka值越小则其酸性越强
C. 某物质其pKb值越小则其碱性越强
D. 物质的酸性强弱一定与其浓度相关
[音频]What is the EU planning to do to EU citizens when they are 18?
A. allow them to go abroad on their own.
B. increase the price of their interrail pass (火车通票)
C. give them a one-month vacation.
D. give them a free interrail pass.
what is the reason behind such a move?
A. To prevent the UK from breaking away from the Eu
B. To build a sense of belonging (归属感）among young people in Europe.
C. to make it easier for Eu citizens to ravel throughout the Continent.(大陆）
D. to give European young people the chance to enjoy the beauty of Rurope.
[音频]According to the police officer, what percentage of jail inmates are high school dropouts?
A. 17.1%
B. 74%
C. 81.2%
D. 19%
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