在探究“根的什么部位生长最快”的实验中，各组同学获得的数据不同，为了得到接近反映真实情况的数据，应该_刷题宝

题干

在探究“根的什么部位生长最快”的实验中，各组同学获得的数据不同，为了得到接近反映真实情况的数据，应该（　　）

A：以最大值作为测量结果

B：以这几组数据的平均值作为测量结果

C：以最小值作为测量结果

D：各组重新做实验，直至测量的数据一致

上一题下一题 0.0难度选择题更新时间:2019-03-19 08:38:38

答案(点此获取答案解析）

B

同类题1

先化简，再求值：

\frac{a + 2}{a + 3}

\frac{a^{2} - 4}{a^{2} + 3 a}

﹣1，其中a=

\frac{1}{2}

同类题2

阅读下面短文，掌握大意。然后从A.B.C.D四个选项中选出最佳选项
I was waiting for the bus when I met the woman. “You look   26 . Come and sit here,” she said. “ 27   are you going?”
“I don’t know. I just want to catch a 28    and see what it will be like at the end.”
“I’m afraid you’ll see 29   there. Why don’t you enjoy the sights on the way?”
“How can I do that while my heart’s   30   ?” I asked sadly. My best friend had left me.
The woman seemed to understand my feeling. “Don’t cry, little girl. I’ve had a similar experience to you. Thirty-five   31   ago, my husband left our three children and me. I was deadly sad. I decided to kill myself and the children, so I took    32   to the sea.   33  ，they seemed to know what would happen, so they   34   loudly. Their cry suddenly woke me 35   . How could I 36    my hope to live for one of life’s problems? After that, I worked hard to raise the children. Now they all live   37    and one of them has his own family.
Then the woman gave me a   38 , “We should never wait for the door to   39     before us. We should find the key to the 40   or try to find another way”
The bus came and I got on it with a smile

同类题3

Come here, children! Look at the elephant.

Wow! It has eyes and ears.

同类题4

下列历史事件，按发生时间先后顺序排列的是

①中共七届二中全会 ②渡江战役 ③三大战役重庆谈判

同类题5

Patricia was born in Michigan and grew up in California. When she was a little girl, she often stayed with her grandparents who lived in Union City, Michigan. One summer day, a meteorite (流星)____ (fall) from the sky, right into her grandparents' backyard! Before that, her grandparents had lived a ____'kwaət life on their farm. Now things were ____from before. They had so much to do. People came to see the meteorite. The professors from the ____juːnɪ'vɜːsɪtɪ came to study it and analyze (分析) it. Her grandparents had never talked to so many people in____(they) lives! Everything changed.

As you can guess, no one in the town had ever____(see) a meteorite before! They were confused (困惑) and didn't know____to do. Some people thought it would bring them good____(lucky) if they touched it.

Patricia loves to tell the story about her meteorite and even today, she carries a piece of the meteorite with her____weər'evə she goes. When I met her, she let all of us touch it and make a____. What might you wish for if you could meet Patricia and see her meteorite?

小学学科试题库

初中学科试题库

高中学科试题库