Winter is around the corner, and most plants are losing their ____ （叶子）. However, bamboo doesn't. ____ (相反), bamboo stands straight and grow fast. Chinese people say that this is bamboo's ____ (精神). It is ____ (勇敢) enough to overcome difficulties.

    Because of this , the Chinese really love bamboo. They call bamboo, along with the pine tree and the plum blossom, the "three cold-resistant ____ (朋友) of winter.

    Bamboo is a common plant all around China. It has many uses in our  ____ (日常的) life. Chinese people learned to use bamboo to make ____ (筷子) ,baskets and even furniture a long time ago. Bamboo is ____ (使用) to cook all kinds of food. Bamboo is also the main food of the giant pandas.

    Bamboo is also very useful in art. Because bamboo is hollow inside, it's a good choice for people to ____ (制作) different things. It's clever to make ____ （音乐的） instruments. There are many kinds of bamboo flutes all over the world.

2017年国家将坚持市场定价、价补分离、主体多元的改革方向，在东北三省和内蒙古自治区继续实施和完善玉米市场化收购加补贴机制，同时调整大豆目标价格政策，对玉米、大豆生产者给予补贴。下列符合政策传导过程的是（    ）

①对玉米、大豆生产者给予补贴——价格上涨，需求下降——鼓励增加种植——提高产量

②玉米收储制度改革——玉米价格逐渐持平——玉米及其替代品的进口减少——提高竞争力

③玉米价格高，农民赚钱——市场定价，价格回归市场——农民开始种植其他作物——农业结构调整

④农民卖粮的收入加上补贴——收益会降低——鼓励支持加工企业——促进农业发展

近年来的地震海啸，给人民的生命财产带来了巨大的损失。自古以来我们的祖先就在探究自然和预防自然灾害方面进行了有益的探究，在这方面成就最大的是：（    ）

Now the air in our city is _______ than it used to be. Something must be done to stop it.