(4分)下面是某兴趣小组探究同质地同数量烟草在不同体积水中浸出液对水蚤心率影响时

题型:探究题

问题:

(4分)下面是某兴趣小组探究同质地同数量烟草在不同体积水中浸出液对水蚤心率影响时记录的数据,请分析回答:

 清水烟草浸出液
70ml60ml50ml40ml30ml
20秒内心跳次数706365676971
(1)该实验的变量是                   

(2)由表可以看出,随着烟草浸出液浓度的升高,水蚤的心率与烟草浸出液的关系是           

(3)实验时一只水蚤只能做两次实验,应先在       中观察,再在烟草浸出液中观察,其先后顺序不能颠倒,因为              

考点:合理营养和食品安全
题型:探究题
Reuben, a 12-year-old boy, saw something in a shop window. But the price—five dollars—was far beyond his means. He couldn’t ask his parents      the money. His father made a living through        in Bay Roberts. His mother, Dora, tried hard to feed and clothe their five children.
Hesitating(犹豫) for a few minutes, he opened the       and talked to the shopkeeper. “…I don’t have the money right now. Can you please        it for me?” “I’ll try,” the shopkeeper smiled.
Reuben respectfully touched his worn cap and walked out. Hearing the sound of hammering from a side street, he suddenly had a(an)      . He ran towards the sound and stopped at a construction site(建筑工地).Reuben knew he could collect the discarded nails(被丢弃的钉子) and sell them to the factory for five cents      .
He looked for nails until sunset. Then he ran to the factory and sold them. Reuben tightly clutched(握紧) the five-cent pieces and ran home. He found a rusty iron can and dropped his       inside. Then he rushed into the barn(谷仓) near his house and hid it. It was dinner time when Reuben got home. His father sat at the big kitchen table, working on a fishnet. Dora was at the kitchen stove, ready to serve       as Reuben took his place at the table. Looking at his mother, Reuben smiled.
Every day after school, Reuben searched the town, trying to finish his     task. Finally, the time had come! He ran into the barn, opened the can, poured the coins out and began to count.
He still needed 20 cents! He had to sell four nails       the day ended. Rushing to the town, Reuben searched every corner. It was getting dark when Reuben arrived at the factory. The man at the factory was about to     .
“Please, mister. I have to sell these nails now—please.”
“Why do you need this money so      ?”
“It’s a secret.”
The man took the nails, reached into his pocket and put four coins in Reuben’s hand.
Clutching the can tightly, Reuben      for the shop.
“I have the      ” he solemnly told the owner.
Back home, his mother was cleaning the kitchen. “Here, Mum! Here!” Reuben shouted as he ran to her. He      a small box in her roughened hand. She opened it carefully. A blue-velvet jewel box appeared. Dora lifted the lid(盖子). Tears began to blur(模糊) her vision. In gold lettering on a small, almond-shaped brooch(胸针) was the word Mother.
It was Mother’s Day, 1946.
小题1:
A.aboutB.forC.ofD.with
小题2:
A.farmingB.drivingC.fishingD.cleaning
小题3:
A.doorB.shopC.windowD.box
小题4:
A.buyB.watchC.makeD.keep
小题5:
A.taskB.goalC.planD.idea
小题6:
A.eachB.anyC.eitherD.all
小题7:
A.nailsB.cansC.coinsD.dollars
小题8:
A.breakfastB.tableC.lunchD.dinner
小题9:
A.publicB.secretC.excitingD.surprising
小题10:
A.beforeB.afterC.whenD.while
小题11:
A.call upB.lock upC.clear upD.turn up
小题12:
A.hurriedlyB.hardlyC.badlyD.immediately
小题13:
A.wentB.lookedC.paidD.left
小题14:
A.pocketB.moneyC.lidD.time
小题15:
A.movedB.pulledC.placedD.took
题型:探究题
两个命题p:对任意x∈R,都有sinx+cosx≤
3
2
;q:若a,b,c为实数,则b2=ac是a,b,c成等比数列的充要条件,则(  )
A.p且q为真B.p或q为假
C.“非p”且q为真D.p且“非q”为真
题型:探究题

下列情形可以进行医师执业注册的是

A.受吊销医师执业证书行政处罚,自处罚决定之日起至申请注册之日止不满1年的
B.受吊销医师执业证书行政处罚,自处罚决定之日起不满2年
C.受吊销医师执业证书行政处罚,自行罚决定之日起满2年不满3年的
D.受刑事处罚,自刑罚执行完毕之日起至申请注册之日止不满1年的
E.受刑事处罚,自刑罚执行完毕之日起至申请注册之日止不满2年的

题型:探究题

水肿病一般无()

A.头面或下肢先肿,继及全身

B.腹皮青筋暴露

C.身发疮痍,甚者溃烂

D.不烦渴,大便溏,小便少,不赤涩

E.全身水肿,按之没指,身困胸闷,纳呆、泛恶

题型:探究题

球会信誉

更多题库