问题 探究题

某生物兴趣小组对“探究种子萌发的外界条件”实验作了如下改进:  

①准备甲、乙两个大玻璃杯,中间各放两个隔板(隔板上钻有许多小孔),装置如图所示。②甲、乙玻璃杯底部和隔板上各放20粒形态大小相似且正常的绿豆种子。③向玻璃杯中加水,使②和⑤两处的绿豆种子接触到水。④甲装置放在温暖的地方,乙装置放在冰箱中。⑤一段时间后,观察种子的萌发情况。请据此实验回答下列问题

(1)隔板钻孔的目的是:使种子在萌发过程中得到_______________。

(2)图中隔板②与⑤互为对照,其变量是_______。设置甲、乙两组装置的作用是_______。

(3)一段时间后观察实验结果,发现只有_____(填标号)处的种子萌发了。

(4)此实验说明种子萌发所需的外界条件是________________。

答案

(1)充足的空气(氧气)  

(2)温度  对照  

(3)②  

(4)适宜的温度,一定的水分,充足的空气

阅读理解

In my profession as an educator and health care provider, I have worked with numerous children infected with the virus that causes AIDS. The relationships that I have had with these special kids have been gifts in my life. They have taught me so many things, but I have especially learned that great courage can be found in the smallest of packages. Let me tell you about Tyler.

Tyler was born infected with HIV: his mother was also infected. From the very beginning of his life, he was dependent on medications to enable him to survive. When he was five, he had a tube surgically inserted in a vein in his chest. This tube was connected to a pump, which he carried in a small backpack on his back. Medications were hooked up to this pump and were continuously supplied through this tube to his bloodstream. At times, he also needed supplemented oxygen to support his breathing.

Tyler wasn’t willing to give up one single moment of his childhood to this deadly disease. It was not unusual to find him playing and racing around his backyard, wearing his medicine - laden backpack and dragging his tank of oxygen behind him in his little wagon. All of us who knew Tyler marveled at his pure joy in being alive and the energy it gave him. Tyler’s mom often teased him by telling him that he moved so fast she needed to dress him in red. That way, when she peered through the window to check on him playing in the yard, she could quickly spot him.

This dreaded disease eventually wore down even the likes of a little dynamo like Tyler. He grew quite ill and, unfortunately, so did his HIV - infected mother. When it became apparent that he wasn’t going to survive, Tyler’s mom talked to him about death. She comforted him by telling Tyler that she was dying too, and that she would be with him soon in heaven.

A few days before his death, Tyler beckoned me over to his hospital bed and whispered, " I might die soon. I’m not scared. When I die, please dress me in red. Mom promised she’s coming to heaven, too. I’ll be playing when she gets there, and I want to make sure she can find me. "

64. What is the boy Tyler's attitude towards death?

A.  optimistic.      B.  pessimistic.   C. sorrowful.              D. fearful.

65. Tyler requested the writer to dress him in red when he died simply because ________.

A. red is a lucky color                 B. red might help to cure him

C. his mom could spot him easily        D. he could find more mates by wearing red

66. Which of the following might serve as a possible title for this passage?

A. My unusual profession.                 B. A caring mother.

C. Mother and son.                         D. Dying in red.

67. The underlined word dynamo in the fourth paragraph here means ________.

A. a promising and helpful youth       B. an extremely energetic person

C. a rare and beautiful flower          D. a magic and understanding superstar

单项选择题