A.
var foods = [”西红柿”,”青椒”,”西葫芦”]; var need = foods[foods.length];
B.
var foods = [”西红柿”,”青椒”,”西葫芦”]; var need = foods[foods.length+1];
C.
var foods = [”西红柿”,”青椒”,”西葫芦”]; var need = foods[foods.length-1];
D.
var foods = [”西红柿”,”青椒”,”西葫芦”]; var need = foods[foods.length-2];