如图所示，在固定的气缸A和B中分别用活塞封闭一定质量的理想气体，活塞面积之比为S_A：S_B=1：2，两活塞以穿过B的底部的刚性细杆相连，可沿水平方向无摩擦滑动．两个气缸都不漏气．初始时，A、B中气体的体积皆为V₀，温度皆为T₀=300K．A中气体压强P_A=1.5P₀，P₀是气缸外的大气压强．现对A加热，使其中气体的压强升到p_A′=2p₀，同时保持B中气体的温度不变．求此时A中气体温度T_A．

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正像人需要营养一样，植物生长也需要成分．下列属于复合肥的是（　　）

Dear friends,
   My name is Helen. I'm 12 years old. I  1  from Taxas, America. I’m really  2   in Chinese geography. It's fun! And I hope you can tell me more. I like hamburgers best,  3   I try to eat them twice a week  4   it's a kind of   5   food. And I like to drink lemon  6   . As for sports, I often go swimming with my parents on weekends.
   I   7  in Cobb Street School. My   8  subjects in school are ME and art. They are really fun! After school, I like to go to the   9   with my family or friends. I like action movies and cartoons. They’re  10   How about you? Do you often go to the cinema with your family or friends?
                                                                                                                                                                   Yours,
                                                                                                                                                                   Helen