[简答题]目前，中国的粮食单产水平与世界粮食高产国家相比也是比较低的，中国要在短时间内达到粮食高产国家的水平难度较大，但经过努力是完全可以缩小差距的。通过改造中低产田、兴修水利、扩大灌溉面积、推厂先进适用技术等工程和生物措施，可使每公顷产量提高1,500公斤以上。

参考答案: At present, China’s per unit area yield of grain is low compared with countries with high grain yields. It will be difficult for China to reach the level of countries with high grain production in a short period of time, but the gap can certainly be narrowed through earnest efforts. The grain output per hectare can be increased by more than A,E00 kg through the upgrading of medium and low-yield land, intensifying water-control projects, enlarging irrigated areas and spreading the use of advanced agrotechnology.