A:CH2=CH—CH2OH
B:CH3COOH
C:CH2=CH—COOH
D:CH2=CH—COOC2H5
How long it to get to his home?
水稻生长期间,如果大部分叶片被害虫吃掉,水稻产量就会大幅度减少, 这是因为水稻的叶片无法进行____ .