可引起成人肠套叠的原因包括（）.

A.肠息肉

B.Meckel憩室

C.腹泻

D.肠道慢性炎症

E.肠道肿瘤

Our bodies are strengthened by taking exercise. _____, our minds are developed by learning. [ ]

A. Probably

B. Likely

C. Similarly

D. Generally