试题与答案

如图所示的铜-锌原电池中 (1)理论上应观察到的现象是 铜片上:________

题型:填空题

题目:

如图所示的铜-锌原电池中

(1)理论上应观察到的现象是

铜片上:__________________锌片上:__________________。

此时原电池的电极反应式是:

正极:__________________负极:__________________。

(2)但在实际实验中,锌片上也有_______________、表面变黑等现象,其原因是_________________。在相同温度下,同样大小的混有碳粒等杂质的锌比纯锌与同浓度同体积的稀硫酸反应的速率_______(选填“要快”、“要慢”、 “相等”、“无法确定”),其微观解释是__________________。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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I recently turned fifty,which is young for a tree,midlife for an elephant,and ancient for a sportsman.Fifty is a nice number for the states in the US or for a national speed limit,but it is not a number that I was prepared to have hung on me.Fifty is supposed to be my father’s age,but now I am stuck with this number and everything it means.

A few days ago,a friend tried to cheer me up by saying,“Fifty is what forty used to be.”He had made an inspirational point.Am I over the hill?People keep telling me that the hill has been moved,and I keep telling them that the high-jump bar has dropped from the six feet I once easily cleared to the four feet that is impossible for me now.

“You’re not getting older,you’re getting better,”says Dr.Joyce Brothers.This,however,is the kind of doctor who inspires a second opinion.

And so,as I approach the day when I cannot even jump over the tennis net,I am moved to share some thoughts on aging with you.I am moved to show how aging feels to me physically and mentally.Getting older,of course,is obviously a better change than the one that brings you eulogies(悼词).In fact,a poet named Robert Browning considered it the best change of all:

Grow old along with me!

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Whether or not Browning was right,most of my first fifty years have been golden ones,so I will settle for what is ahead being as good as what has gone by.I find myself moving toward what is ahead with a curious blend(混合)of both fighting and accepting my aging,hoping that the philosopher(哲学家)was right when he said.“Old is always fifteen years from now.”

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