Everyone knows that exercise is important. We all need to exercise. Doctors say it is good for us. It makes your heart and body strong. Children who often exercise are more alert（灵活）. That means they do better in tests and schoolwork than those who don’t exercise.
They are many ways to exercise. You can walk, run, swim, skate, or play ball games. Make sure you exercise in the following ways: You have to like what you are doing. Exercise enough--- but not too much. It’s best to exercise twice a week. Thirty minutes each time is enough. Try all kinds of sports until you find one, two or even three sports that feel right for you.
You can exercise at fitness centers. They have a lot of equipment（设备）there. The equipment will help exercise your arms, legs and other parts of your body to make you healthy. Some people buy equipment for their homes. But it’s very expensive.
小题1:the underline word “fitness centers” in the passage means _____.
A．商务中心
B．健身中心
C．医疗中心
D．购物中心小题2:The sport “_____” is not told in the passage.
A．playing soccer
B．skateboarding
C．walking
D．running小题3:The doctors say that exercise can make your heart and body _____.
A．ill
B．happy
C．strong
D．health小题4:About “exercise”, which statement of the following is NOT right?
A．Thirty minutes’ exercise each time is enough.
B．You have to exercise too much every day.
C．You needn’t do all kinds of sports to keep healthy.
D．You have to like the sports that you are doing.小题5:It’s best to exercise _____.
A．at fitness centers
B．in groups
C．in the morning
D．twice a week
（单位：10N·mm）标注于构件旁侧。假定，梁考虑两侧楼板影响的刚度增大系数取《高层建筑混凝土结构技术规程》（JGJ3-2010）中相应条文中最大值。提示：①计算内力和位移时，采用D值法。②
，式中α是与梁柱刚度比有关的修正系数，对底层柱：
，对一般楼层柱：
，式中，
为有关梁柱的线刚度比。
