单选题
1.【完成句子】 Recent studies showed that the average high school student spends fifteen to thirty hours a week watching television and only two hours a week in organized play or exercise. That is one reason why one-third of the 200,000 pupils tested for the President's Council on Physical Fitness failed a simple test of strength,stamina,and flexibility. Some of the boys and girls could not raise themselves to a sitting position without using their hands！
Some people have difficulties in standing up due to _________.
A.be overweight
B.lacking adequate exercise
C.hurt badly
D.not used
正确答案：B
答案解析：本段最后提到有些人不用手支撑就站不起来是因为缺乏足够的锻炼。