试题与答案

在探究“鱼鳍在游泳中的作用”实验中,同学们进行了如下一些探究.请回答问题. 第一

题型:解答题

题目:

在探究“鱼鳍在游泳中的作用”实验中,同学们进行了如下一些探究.请回答问题.

第一小组的同学准备了两条鱼,将其中的一条鱼所有的鳍同时都捆扎起来,再将其放入玻璃缸的水中;将另一条鱼放入另一玻璃缸的水中,然后进行观察.

第二小组的同学准备了四条鱼,他们将四条鱼分别捆扎起胸鳍、背鳍、腹鳍、尾鳍(即每条鱼只捆扎起一种鳍),然后再将它们分别放入四个玻璃缸的水中,进行观察.

(1)请你对这两组同学的实验方法进行评议(从下 * * 个选项中选择评议结果):

①你对第一组同学实验方法的评议是______

②你对第二组同学实验方法的评议是______

A.其实验方法正确

B.其实验方法没有设置对照组

C.其实验方法不能保证单因素对鱼游泳时的影响

(2)鱼的身体呈______形,这可以减少在水中游泳时的阻力.

(3)右图是同学们观察到的鱼的外形示意图,其中标号1是______ 3是______

(4)如果将鱼鳍5固定,鱼在游泳时身体不能直立,由此可见鱼鳍5所示的作用是保持______ 的关键.

(5)如果将鱼鳍1固定,鱼在游泳时会左右摇摆,并且不能转换方向,由此可见,1所示的鳍的作用是保持鱼体的______ 和转换方向.实际上鱼的游泳是靠身体的______部的摆动和各种______的协调作用而实现.

(6)在探究鱼鳍的作用时,最好不采取减掉鱼鳍的做法,原因是______.

答案:

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B. 16          

C. 18

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The United States is one of the few countries in the world that has an official day on which fathers are honored by their children.On the third Sunday in June, fathers all across the United States are given presents, treated to dinner or otherwise made to feel special.

However, the idea for creating a day for children to honor their fathers began in Spokane, Washington.A woman by the name of Sonora Smart Dodd thought of the idea for Father’s Day while listening to a Mother’s Day sermon in 1909.Having been raised by her father, Henry Jackson Smart, after her mother died, Sonora wanted her father to know how special he was to her.It was her father that made all the parental sacrifices(牺牲) and was, in the eyes of his daughter, a selfless and loving man.Sonora’s father was born in June, so she chose to hold the first Father’s Day celebration in Spikane, Washington on the 19th of June, 1910.

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When children can’t visit their fathers or take them out to dinner, they send a greeting card.Traditionally, fathers prefer greeting cards that are not too sentimental(伤感的).Most greeting cards are too special so fathers laugh when they open them.Some give heartfelt thanks for being there whenever the child need Dad.

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