问题 解答题

给你提供西瓜种子和其它必要的实验器材,请设计实验探究种子萌发与光的关系.

(1)实验目的:______

(2)实验方法:______

(3)实验步骤:

①取两个大小一样的锥形瓶,分别记为A、B,瓶中垫数层餐巾纸,并加水使餐巾纸湿润.然后将西瓜种子等分为两份,一份放入A中,一分放入B中(其它条件如温度、空气等都相同且适于种子萌发).

②______

③______

(4)若实验结果出现如下三种情况之一,请说明实验结论.

①A和B中的种子同样萌发,说明西瓜种子萌发与光照______.

②A中种子萌发,B中种子不萌发,说明西瓜种子萌发______.

③A中种子不萌发,B中种子萌发,说明西瓜种子萌发______.

答案

由题意可以知道:(1)实验目的:探究西瓜种子萌发与光照的关系.

(2)实验方法:探究实验根据实验探究的目的确定变量,进行分组设置对照实验,

(3)实验步骤:

①取两个大小一样的锥形瓶,分别记为A、B,瓶中垫数层餐巾纸,并加水使餐巾纸湿润.然后将西瓜种子等分为两份,一份放入A中,一分放入B中,而且其它条件如温度、空气等都相同且适于种子萌发.

②将A放在有光环境中,将B放在无光环境中.

③放置一段时间,观察记录瓶中种子萌发情况.

(4)①A和B中的种子同样萌发,则说明西瓜种子萌发与光照无关.

②A中种子萌发,B中种子不萌发,说明西瓜种子萌发需要光.

③A中种子不萌发,B中种子萌发,说明西瓜种子萌发不能有光.

故答案为:(1)探究西瓜种子萌发与光照的关系 (2)分组对照实验  (3)将A放在有光环境中,将B放在无光环境中(其它条件相同);观察记录瓶中种子萌发情况.(4)无关;需要光;不能有光

完形填空
Like any good mother, when Karen found out that another      was on the way, she did what she could to help her three-year-old son, Michael,        for a new life. They found out that the new baby was going to be a girl, and every day Michael sang to his        in Mommy’s tummy.
The days went by. The little girl got        after the birth. The doctor told the parents, “There is very        hope. Be prepared for the worst.” They had fixed up a special         in their home for the new baby, but now they        a funeral.
Michael kept begging his parents to let him see his sister. “I want to        to her,” he said. If he didn’t see sister now, he might never see her     . She dressed him in an oversized suit and marched him into ICU, but the head nurse        him as a child and shouted. “Get the kid out of here now! No children are     .” The mother rose up strong, and the       mild-mannered lady glared steel-eyed into the head nurse’s face. “He is not leaving     he sings to his sister!” Karen towed Michael to his sister’s bedside. He gazed at the tiny infant         the battle to live, and he began to sing. In the pure        voice of a 3-year-old, Michael sang:
“You are my sunshine, my only sunshine. You make me happy when skies are gray....”
Instantly the baby girl        . The pulse rate became calm and steady.
“You never know, dear, how much I love you. Please don’t take my        away.”
“The other night, dear, as I lay sleeping, I        I held you in my arms.....”
Michael’s little sister relaxed.
The medical staff just called it a miracle. Karen called it a miracle of God’s       !
NEVER GIVE UP ON THE PEOPLE YOU LOVE. LOVE IS SO        POWERFUL.
小题1:
A.babyB.relativeC.boyD.girl
小题2:
A.delightB.playC.prepareD.study
小题3:
A.motherB.sisterC.parentsD.father
小题4:
A.worseB.wellC.betterD.terrible
小题5:
A.muchB.bigC.someD.little
小题6:
A.bedB.roomC.chairD.toy
小题7:
A.plannedB.attendedC.heldD.expected
小题8:
A.talkB.smileC.singD.dance
小题9:
A.afraidB.asleepC.awakeD.alive
小题10:
A.treatedB.viewedC.promisedD.recognized
小题11:
A.refusedB.allowedC.attendedD.forbidden
小题12:
A.seldomB.usuallyC.rarelyD.constantly
小题13:
A.whenB.afterC.ifD.until
小题14:
A.winningB.gettingC.losingD.fighting
小题15:
A.heartedB.brokenC.wonderfulD.frightened
小题16:
A.criedB.laughedC.respondedD.answered
小题17:
A.sunshineB.sisterC.happinessD.gift
小题18:
A.knewB.sawC.hopedD.dreamed
小题19:
A.songB.voiceC.loveD.smile
小题20:
A.SIMPLYB.UNBELIEVABLYC.STRANGELY D.EASILY
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