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．

下列有关说法正确的是（   ）

Exercise—It's good for you!

Playing sports，dancing and even touching your toes is exercise．Exercise builds a strong body．This helps you to do all the things you want to do．

⒈Exercise helps you to keep fit

Can you bend(弯腰)down and touch your toes? Can you stretch(伸展)up high? Exercise helps you to bend and stretch easily．

⒉Exercise makes you strong

Use your arms and legs often．Exercise builds strong muscles(肌肉)．

⒊Exercise makes you feel good

Running，jumping and playing with your friends is exercise．It makes you happy．

⑴为图片选择合适的编号，⑵⑶⑷根据短文内容，选择正确答案。