《献血法》的立法宗旨不包括A．发扬人道主义精神 B．开展国际合作与交流 C．保障献血

About fifty years ago, plant physiologists set out to grow roots by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and the usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require energy, of course. The process of respiration uses sugar to make the high energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.The study of isolated roots has provided an understanding of the relationship between shoots and roots in intact plants. The leaves of the shoots provide the roots with sugar and vitamins, and the roots provide the shoots with water and minerals. In addition, roots can provide the shoots with organic nitrogen compounds. This comes in handy for the growth of buds in the early spring when leaves are not yet functioning. Once leaves begin photosynthesizing, they produce protein, but only mature leaves can "export" protein to the rest of the plant in the form of amino acids.

What is the main topic of the passage

A．The relationship between a plant’s roots and its shoots.

B．What can be learned by growing roots in isolation.

C．How plants can be grown without roots.

D．What elements are necessary for the growth of plants.

阅读以下关于硬件防火墙配置的技术说明，根据要求回答问题1～问题5。
【说明】
某单位在部署计算机网络时采用了一款硬件防火墙，该防火墙带有3个网络接口，其网络拓扑如图7-9所示。

（8分）

在美国夏威夷举行的亚太经合组织（ APEC）第十九次领导人非正式会议上，中国国家 * * 胡 * * 发表了《转变发展方式实现经济增长》的重要讲话。指出中国坚定不移参与区域和国际经济合作，寻求自身发展与承担力所能及的国际责任相结合，推动全球贸易和投资自由化便利化进程，为实现亚太地区和世界的持久和平、共同繁荣作出新的更大的贡献。

（1）请分别按成员性质、地理范围和职能范围说明APEC是哪种类型的国际组织？（6分）

（2）请简要说明中国与APEC的关系。（2分）

下列关于美式看涨期权的表述中，正确的是（）。

A.美式看涨期权只能在到期日执行

B.无风险利率越高，美式看涨期权价值越低

C.美式看涨期权的价值通常小于相应欧式看涨期权的价值

D.较长的到期时间能增加其价值

（）是教师职业道德的核心，是教师开展专业活动的基础和前提。