一元硬币的外观有银白色的金属光泽,一些同学认为它可能是铁制成的。在讨论时,有同学

题型:选择题

问题:

一元硬币的外观有银白色的金属光泽,一些同学认为它可能是铁制成的。在讨论时,有同学提出:“我们可以先拿磁铁来吸一下。”就“拿磁铁来吸一下”这一过程而言,属于科学探究中的 [ ]

A.实验 

B.比较

C.观察

D.分类

考点:化学科学探究
题型:选择题

“Cool”is a word with many meanings.Its old meaning is used to express (表达)a temperature that is a little bit cold.As the world has changed,the word has had many different meaning.

“Cool”can be used to express feelings of interest in almost anything.When you see a famous car in the street,maybe you will say,“It’s cool.”You may think,“He’s so cool,”when you see your favourite footballer.

We all maximize(扩大) the meaning of“cool”.You can use it instead of many words such as “new” or “surprising”.Here’s an interesting story we can use to show the way the word is used.A teacher asked her students to write about the waterfall(瀑布)they had visited.On one student’s paper was just the one sentence(句子),“It’s so“cool”.Maybe he thought it was the best way to show what he saw and felt.

But the story also shows a scarcity(缺乏)of words.Without “cool”,some people have no words to show the same meaning.So it is quite important to keep some credibility(可信性).Can you think of many other words that make your life as colourful as the word “cool”? I can.And I think they are also very cool.

小题1:We know that the word “cool has had ________.

A.only one meaning

B.no meanings

C.many different meanings

D.the same meaning小题2:In the passage,the word “express” means“________”.

A.see

B.show

C.know

D.feel小题3:If you are _______ something,you may say,“It’s cool.”

A.interested in

B.angry about

C.afraid of

D.unhappy with小题4:The writer takes an example to show he is ________ the way the word is used.

A.pleased with

B.strange to

C.worried about

D.careful with小题5:In the passage,the writer suggests(暗示)that the word “cool”________.

A.can be used instead of many words

B.usually means something interesting

C.can make your life colourful

D.may not(可能不) be as cool as it seems

题型:选择题

仿照示例,造两个句子。

  如果你是鱼儿,那快乐就是一汪清清凉凉的水:如果你是小草,那快乐就是一束暖暖香香的阳光:如果你是___________,那快乐就是___________;如果你是___________,那快乐就是___________。 

题型:选择题

桌上有凸透镜和凹透镜各一个,不借助其他实验器材,请你用两种方法把它们判断出来,并测出凸透镜的焦距,简单写出测量的步骤。

题型:选择题

声音必须转换成为二进制信息后才能在计算机中存储和处理,假如语音信号数字化时取样频为8KHz,量化精度为8位,如果不进行数据压缩的话,每分钟的数据量是

A.480KB

B.8KB

C.240KB

D.3840KB

题型:选择题

商号指明的是企业的承担者,而行号指明的是()。

A.商主体

B.商事经营者

C.商行为

D.企业

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