若最简二次根式a+b3a与a+2b是同类二次根式，则ab的值是（ ） A．2 B．1

答案：

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1. amuse the sad girl 2. Owing to a variety of reasons 3.charged me 5 yuan for the taxi  4. were charged with 5. the admission to the lecture 6. an admission 7. made a profit 8. profit from 9. involving several children 10. experimental 11.The advance of science technology 12.voluntary