Plastic bags are useful for holding many kinds of food, ________their cleanness, toughness and low cost.
句意：塑料袋由于其清洁、韧性好、成本低等优点，可以用来装不同种类的食物。by virtue of由于，凭借。in addition to除……之外。for the sake of为了。as opposed to与……相对。因此，本题的正确答案为A。