第二节 请认真阅读下面短文，从短文后所给的六个选项中选出五个可以填入空白处的最佳选项。
We all know exercise helps keep our hearts healthy. 41 But many people find it hard to make time for regular exercise. The good news is that even small amounts matter.
Scientists have found something interesting. The less active you are now，the more benefits(好处) you'll get. Just from a little exercise! If you sit most of the day and rarely move，2 hours of simple activities a week can be life-changing. This could be like riding in the park，fast walking with friends，or playing outdoor games. 42 These easy exercises can lower your heart disease risk by about 20%!
However，the benefits work differently for people who already regularly exercise. ______ 43 ______ After 4—6 hours of exercise a week，the heart protection doesn't increase much. This means both beginners and regular exercisers can find suitable exercise plans.
44 For busy people，weekend exercise still helps. Even if you only have time on Saturdays and Sundays，those 2—3 hours of sports or swimming count.
The key message is clear. Any exercise is better than none. 45 You can try ten-minute walks daily，dancing to music，or taking stairs instead of elevators. You will have a healthier heart.
Remember，staying healthy doesn't require becoming an athlete. Find activities you enjoy，make small changes，and keep doing them. Two hours might sound short，but it's enough to start protecting your heart and changing your life!
A. For active people，their heart benefits grow slower as they exercise more.
B. Doctors say what matters most is getting moving，not when you do it.
C. Finding time to exercise in the park is a challenge.
D. It can lower blood pressure and reduce heart attack risks.
E. You'll be surprised to find it can make a big difference.
F. Start with what you can manage.
41. 42. 43. 44. 45.