To promote agricultural development and eradicate hunger and poverty remains a major challenge of the world and a common responsibility of mankind。促进农业进步，消除饥饿和贫困，依旧是世界面临的重大挑战，也是全人类肩负的一同责任。
请问为何是“ To promote agricultural development”而不是“promoting agricultural development”。
作主语的动词不定式含有以后意味时，不可以改为动名词。比如：
To care for wisdom and truth and the improvement of the soul is far better than to seek money and honor and reputation. 尊重常识，追求真理，净化心灵，比追求资金、荣誉和名声高尚得多。
（赵俊英：《现代英语语法》p.460）
所以，问题中的“ To promote agricultural development”不可以改为“promoting agricultural development”。
