【单选题】'If we don't achieve some major step changes in crop yields by 2050,' says Dr. James Hartwell, 'there will be a major shortfall in available food to feed the world's population.' It's a serious proble...
A.
world population will be a serious problem in the future
B.
Hartwell and his team has found a total solution to the food shortage
C.
the Kalanchoe fedtschenkoi needs more water than other plants
D.
the crops fit to the desert conditions is significant