据统计，引起下消化道出血最常见的原因是（）。
A.肠结核
B.溃疡性结肠炎
C.痔
D.大肠息肉
E.大肠癌
参考答案：B, D, E
He hasn't slept at all for three days. ____he is tired out.[ ]
A. There is no wonder
B. There is no need
C. It is no wonder
D. It is no way
当事人逾期不履行行政处罚决定的，公安消防机构可以申请人民法院强制执行。（）
