“能用众力，则无敌于天下矣；能用众智，则无畏于圣人矣。”这句话反映了（    ）

①合作中需要竞争，竞争中存在合作    ②善于合作必须集思广益，扬长避短

③善于合作必须合理分工，科学计划    ④善于合作必须有效指挥，相互配合

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范仲淹有志于天下
【原文】范仲淹二岁而孤，家贫无依。少有大志，每以天下为己任，发愤苦读，或夜昏怠，辄以水沃面；食不给，啖粥而读。‖既仕，每慷慨论天下事，奋不顾身。乃至被谗受贬，由参知政事谪守邓州。‖仲淹刻苦自励，食不重肉，妻子衣食仅自足而已。常自诵曰：“士当先天下之忧而忧，后天下之乐而乐也。”

高茎豌豆（Dd）自交产生的F₁中，不同类型个体数目的比例，理论上应是（）

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    Mr. Smith lived in a big city. When he retired(退休), he bought a small 1in a village near the sea. He2it and hoped to live a quiet life in this house.

    But to his great surprise, many visitors came to see his house in summer holidays, for it was the most 3building in the village. From morning to night there were 4outside the house. They kept looking 5the rooms through the windows and many of them even went into Mr. Smith's garden. This was too much for Mr. Smith. He decided to ask the visitors to 6. So he put a notice (告示) on the window. The notice said, “If you want7it, come in and look round. Price: twenty dollars.” Mr. Smith was sure that the visitors could8coming, but he was wrong. More and more visitors came and Mr. Smith had to 9every day taking them around his house.“I came here to 10not to work as a guide,” he said angrily. In the end, he sold the house and moved away.