材料一  为了制止进攻性力量的增长，将开始严密封锁运往古巴的一切进攻性的军事装备。从任何国家或港口驶往古巴的不论什么种类的一切船只，如果发现载有进攻性武器，将迫使它们转回。

本国的政策是把从古巴对西半球任何国家发射的任何核导弹看成是苏联对美国的进攻，需要对苏联做出充分的报复性的反应。

                            ——肯尼迪关于封锁古巴的演说(1962年10月22日)

材料二  ……因此，怎么可以得出您现在所做出的那种完全不正确的解释，也就是说，古巴的武器是进攻性的?古巴领土上的武器都是防御性的，这一点我请您相信，而且，我们是应古巴政府的请求才把武器运往古巴的，纯粹是为了防御。可您却还在说这是进攻性武器。只要不发生入侵古巴或袭击苏联和我们的其他邻国的事情，这些武器当然现在和将来都不会对任何人构成威胁。因为它们没有攻击目标。

                           ——赫鲁晓夫致肯尼迪的信(摘录)(1962年10月26日)

材料三  ……我认为，在我们同所有亚洲友邦的关系方面，现在应当十分强调以下两点：第一，我们将恪守我们的条约义务，例如我们根据东南亚条约组织对泰国的条约义务；但是，第二，在国内安全问题上，在军事防务问题上，除非受到一个大国的带有核武器的威胁，美国将鼓励并有权期望逐渐由亚洲各国自己来处理，自己承担起解决的责任。

——尼克松在关岛关于亚洲政策的讲话(1969年7月25日)

    Many cities and towns have laws that require people to recycle paper and plastics. Now some state and local governments have passed laws that require citizens to recycle their food waste as well. California and Vermont have statewide laws about recycling food waste that apply to businesses and homes. The process of recycling food waste and turning it into usable soil is called composting(堆制肥料).

    Food waste that can be composted includes fruit and vegetable peels, coffee grounds, tea bags, and eggshells. Garden waste such as stems and leaves can also be composted. Meat, fish, and dairy food waste cannot be recycled.

According to environmental groups, composting reduces the amount of trash going into landfills(垃圾填埋池), and composted waste holds a wide range of nutrients. When compost is added to the soil in gardens and fields, it helps crops grow.

    Reducing the amount of waste that goes into landfills is one reason why cities and states are passing food-waste recycling laws. “Our landfills are far from enough for the creation of new ones is shrinking.” Renee Crowley, a project manager said.

    Officials in Seattle, Washington, say that food waste makes up 30% of the trash going into landfills, and they are looking to reduce that percentage. That city has a law requiring people to recycle food waste. It is banned from all garbage. There is a fine for people who put it into regular garbage.

    Crowley points out that even in cities where food recycling is not a law, there are often places where citizens can drop off their food waste for composting. Many schools and colleges have also started composting programs.

    Those who are against food-recycling laws say that the composting process is costly. In addition, it can be difficult for people who live in apartments to store their waste because they don't have access to outside storage bins. Patti Ferguson from Orange County, California, told her local newspaper that she thought an indoor container containing food waste would get smelly.