单选题：Exercise Cuts Cancer Deaths in MenMen who exercise often a

Exercise Cuts Cancer Deaths in Men
Men who exercise often are less likely to die from cancer than those who 51 ，new research published in the British Journal of Cancer revealed yesterday．
A team of scientists from the Karolinska Institute in Sweden looked 52 the effect of physical activity，and cancer risk in 40，708 men aged 53 45 and 79．
The seven-year study found that men 54 walked or cycled for at least 30 minutes a day had a 34 per cent lower 55 of dying from．cancer than the men who did less exercise or nothing at all． 56 the period studied，3，714 men developed cancer and l，153 died from the disease．The researchers suggest that half all hour’s walking 57 cycling a day increased survival among these men by 33 per cent．
The researchers surveyed men from two counties in central Sweden about their lifestyle and the amount of 58 activity they were usually doing．They then scored these responses and compared the results with data on cancer diagnosis and death officially recorded in a central cancer registry(登记簿)over a seven—year 59 ．Lead author，Professor Alicja Wolk，said： “These results clearly show for the first time the effect that very simple and basic daily 60 such as walking or cycling has in reducing cancer death risk in middle—aged and elderly 61 ．”
Dr．Lesley Walker．director of cancer information at Cancer Research UK．said：“This study gives US a clear indication that men who exercise are less 62 to die from cancer,and that they are more likely to 63 the disease if they get it．It’S not entirely clear from this study what role exercise plays in preventing 64 in men，but we do know that a healthy lifestyle Can prevent up to half of all cancers—and 65 exercise forms a key part of this．”
根据以上内容，回答题。
A．didn’t
B．don’t
C．won’t
D．can’t