问题 补全对话,情景问答
阅读下面短文,将短文后的五个选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。
       Mr. Johnson worked in a restaurant. He worked there for ten years.  1  . And at last he was sent
away. He hated hard work and stayed in the city.
       Once something was wrong with his ear. He had to see a doctor.  2  . And five minutes later he had
to pay the doctor twenty dollars. He thought it was easy to get much money. So he came to the small
town and opened a hospital. At first the people there knew nothing about him and they came to see him.
But soon they found he couldn't treat them at all and his medicine wasn't useful. People hardly came and
he had nothing to do.
       One evening he heard a knock at the door.  3  . He thought he had a bad cold and he asked him to
take some medicine. After that the man left.  4  .
       On the third day a young man came in and said, "Thank you very much, doctor ! "It surprised
Mr. Johnson. He said, "I haven't seen you before. What do you thank me for?"
       My uncle died from your wrong treatment the day before yesterday and he left much money to me.
A. He got up quickly and saw a traveler lying in front of his hospital.
B. But he wasn't a good cook.
C. The doctor looked him over and gave him some medicine.
D. The following morning he was told the traveler died in a hotel.
E. At last, the young got a lot of money.
答案

1-4 B C A D

填空题

随着工业化的快速发展及化石燃料的大量使用,人们向大气中排放的二氧化硫等有害气体逐年增多.二氧化硫进入大气后,可在局部地区富集并在水的凝集过程中形成硫酸等酸性物质,随着雨水降落下来,这就是“酸雨”(pH<5.6).酸雨的酸性程度可用pH值来表示,一般说来,pH值越小,其酸度就越大.酸雨对植物的生长有没有影响?某生物兴趣小组的同学想以小麦种子为材料,探究酸雨对种子萌发的影响.

(1)小组同学提出的问题是:______.

(2)作出的假设是:______.

(3)实验材料用具:大小相同的培养皿四只,大小、饱满程度相同的小麦种子100粒,小纱布10块,以硫酸为材料配制的pH=5、pH=4、pH=3、pH=2的“酸雨”各20mL等.

(4)实验步骤:①将4只培养皿分别编号为A、B、C、D.②在四只培养皿里各铺一块小纱布,其上均匀各撒20粒小麦种子,然后再用小纱布盖好.③向A、B、C、D四只培养皿中分别喷洒pH=5、pH=4、pH=3、pH=2的“酸雨”各1mL.④盖上培养皿,将它们都放在适于种子萌发的环境里.

(5)该小组同学在实验步骤中有不当之处,请指出并改正.______.

(6)预测结果并得出结论:

①随着pH值逐渐减小,种子萌发率逐渐升高,说明酸雨对种子的萌发有促进作用.

②随着pH值逐渐减小,______.

③随着pH值逐渐减小,______.

(7)有人认为只要用1粒小麦种子做实验就行了,你说呢?请简述你的理由.

______.

名词解释