下列治疗方法中，可使痔核逐步缺血坏死脱落的是（）。

A.温水坐浴

B.冷冻疗法

C.红外线凝固

D.结扎法

E.枯痔丁疗法

Which of the following statements is closest in meaning to the passage you have just heard().

A. There is plenty of grain in the world and people need not to worry about it.

B. The world’s population is estimated to explode from over 6 billion now to 19 billion by 2050.

C. The population increase is mainly in undeveloped countries.

D. World demand for foods is predicted to rise 50% by 2030.