淮南市第三届农民艺术节在潘集成功举办，舞台上演员们唱出了五彩淮南，精彩潘集，他们

阅读下面短文，根据上下文和所给单词首字母，写出标有题号的每小题空白处适当单词的完全

正确形式。

     Class 5 was the worst class in Hill Valley Hight School. The students were badly behaved and had no

(1) i______ in their lessons. When a new headmaster came to work at the school, he decided to do

(2)s______about Class 5. On the second day of school, he left his (3)o______ and walked to Class5's room.

He did not have to know (4)w______ it was. He could heard the noise from it. He stood outside the classroom

for a few moments and looked (5)i______ through the window. Some boys were fighting. Other students

were throwing things at one (6)a______. (7)N______ was doing any work.

     The headmaster had experienced in badly behaved classes before. He (8)k______ what to do. He would go

into the classroom, take hold of the biggest boy in the class and (9)p______ him.This would be an (10)e______

to the others. He took a (11)d______ breath and opened the classroom door.

     The students paid no attention to him. "Silence" he shouted at the top of his (12)v______. This time the

students (13)s______ what they were doing and looked at him. Quickly he walked up to the oldest-looking

boy in the room. He was also the noisiest and had been (14)s______ at the top of his voice. He took hold of

him by ear and pulled him to the (15)f ______ of the class.

     "I'am going to punish you as an example to the others", he said."Now go to my office and (16)w______

for me." Then he (17)t______ to the class and told them about what they should do in (18)s______. When he

finished, he said,"Does anyone have any (19)q______?" One of the students put up her hand and said, "Yes, sir,

I have. When can we have our teacher (20)b______?"

下列说法正确的是

A．研究有机物的基本步骤是：分离、提纯→确定实验式→确定分子式→确定结构式

B．研究有机物的基本步骤是：分离、提纯→确定分子式→确定实验式→确定结构式

C．对于任意比混合的C₂H₄、C₂H₆、C₂H₂混合气体，只要混合气体物质的量不变，完全燃烧后产生的CO₂物质的量随混合气体中C₂H₆的增加而增大

D．因苯酚有毒，对皮肤有腐蚀性，如不慎沾到皮肤上，应立即用酒精洗涤

如图7-27所示三相对称三线制电路中，线电压为380V，且各负载Z=R=22Ω。此时功率表读数为（）W。

A.3800

B.2200

C.0

D.6600

口腔健康教育的最终目的是

A．建立口腔健康行为

B．增长口腔保健知识

C．定期口腔健康检查

D．了解口腔保健措施

E．积极治疗口腔疾病

发动机起动后，若无滑油压力或滑油压力很小，应（）？

A.增面滑油散热器风门开度，降低滑油温度，提高滑油压力

B.增加发动机功率，提高滑油压力

C.使发动机立即停车检查