计算： （1）（-2a）3=______； （2）（a2b3）4=______；

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______?"

下列有关有机磷的性状描述不正确的是（）

A.易挥发

B.呈淡黄色

C.多数为液体

D.有大蒜样气味

E.在碱性环境中稳定

English has been very popular because it is the _______ language in many western countries.

A．official

B．fluent

C．gradual

D．frequent

上腹壁反射消失提示胸段脊髓损害位于（）。

A.T₄～T₅

B.T₅～T₆

C.T₇～T₈

D.T₉～T₁₀

E.T₁₁～T₁₂

The average age for women to marry is between 18 and 25.25 tend to (1) when somewhat older. A church wedding often (2) the legal civil ceremony, and a large reception, which often involves (3) music and dancing, is held in the evening. Wedding traditions include (4) money on the bride’s dress to represent future prosperity, the groom (5) the bride at her home, and the couple pulling on opposite (6) of a loaf of bread—whoever gets the largest piece will be (7) boss of the family. Honeymoons are a new tradition.
The principle (8) mutual support is valued in the Bulgarian family. The elderly are (9) cared for by their adult children. Unmarried adults live with their (10) and many newly married couples live with one set of parents (11) they are able to get housing of their own. Most families (12) urban areas live in apartments, which are in short
supply, while (13) in rural areas usually have their own houses. Many village houses (14) owned by families who live in urban areas, who use them_ (15) summer and weekend retreats, or for retired parents.
Most families in (16) areas do not have more than two children, while families in (17) areas tend to be larger. Grandparents play an important role in (18) care, particularly in urban areas, where most women work outside the (19) . Men of the younger generation have begun to help with household (20) , once considered only women’s responsibility.