简述简述苹果的贮藏方法？
参考答案：
1沟藏
2通风贮藏库贮藏
3冷藏库贮藏
4气调贮藏
For many online shops, the price of their products can be decreased _______ 30% in the holiday seasons.
A．to
B．of
C．by
D．on
福美双主要用于处理（）和土壤，防治苗期立枯病。
A.植株
B.根
C.种子
D.叶
