材料：几年前，李宁公司不惜重金聘请专家，开始研发一款高科技含量的运动鞋。经过四载春秋、几百次实验，该公司终于推出了“李宁弓”运动鞋。实验结果表明：无论在减震还是保护运动员脚踝方面，“李宁弓”运动鞋的性能都超过了传统的气垫鞋。专家称，这是运动鞋领域的又一次深刻变革。
阅读上述材料，结合教材知识，回答下列问题：
（1）“李宁弓”运动鞋的成功说明了什么道理？
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（2）这则材料，对我们有何启示？
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People should _________ down trees in order to protect the environment.
A．be stopped to cutting
B．stop to cut
C．be stopped from cutting
D．stop from cutting
下列关于美国政治制度的表述正确的是[ ]
①美国是实行两党制的典型国家
②美国是实行总统制共和制的典型国家
③美国的国家结构形式是联邦制
④美国是资产阶级专政的国家
A、①②④
B、②③④
C、①②③④
D、①③④
When Christopher Columbus landed on the then unnamed Costa Rica in 1502, he saw many Indians wearing gold earrings. So he thought the land must be rich in gold. He named the place Costa Rica, which means “rich coast” in Spanish.
Though little gold was found, Costa Rica today is indeed rich with coffee and bananas. Coffee is the most important product in Costa Rica and most of it is exported (出口) to other countries like America and Germany. Bananas are the country’s second most important export.
Costa Ricans also grow many other crops such as fruits, corn and beans for their own use. Costa Ricans love colors and their houses are painted in bright colors.
Education is very important to the Costa Ricans. Almost every village has a school and education is a must for children between seven and fourteen years of age. Boys and girls go to separate (单独的) schools. Classes begin in March and end in November. The other three months of the year are harvest time and the children have to help their parents to pick coffee beans.
小题1: What’s the main idea of the first paragraph?
A．How Columbus found Costa Rica.
B．How Costa Rica got its name.
C．What the Costa Ricans wore.
D．What language the Costa Ricans spoke.小题2: The Costa Ricans may NOT paint their houses ______.
A．pink and red
B．grey and black
C．blue and green
D．yellow and orange小题3: In Costa Rica, boys and girls between seven and fourteen ______.
A．must go to school
B．study in the same school
C．do not have to go to school at all
D．can choose to stop schooling at any time小题4: From December to February, school children in Costa Rica ______.
A．have lessons every day
B．have their examinations
C．help their parents pick coffee beans
D．help their parents decorate their houses小题5: This passage is mainly about ______.
A．Christopher Columbus
B．Costa Rica
C．some products from Costa Rica
D．the education of Costa Rica
电网输入电压应正常，电压波动应在额定值（）的范围内。
A、±5%
B、±6%
C、±7%
D、±8%
亚硝酸盐食物中毒流行病学特点食物中亚硝酸盐的来源，归纳起来主要有以下几方面：