齿条齿廓上各点的齿形角相等，且等于（） A.20° B.22° C.23° D.25

有以下程序：

A="-6"  

B="2"  

If  A<0  then

A="-A"  

END  if  

B="B^2"

A="A+B"  

C="A-2*B"

A="A/C"

B="B*C+1"

Print  A,B,C

输出结果是______,________,_________.

阅读理解。

     Outside our hotel in Ho Chi Minh City, Vietnam, a seemingly ancient woman waited beside

the door with her hand outstretched. Every day I put my hand in hers as our eyes met. She never

failed to return my smile, my grasp, and my greeting.

    On the last day of our visit, I found myself alone on a busy corner across the street from our

hotel. Bicycles and motorbikes rushed in front of me. As I hesitated on the sidewalk, I felt a hand

on my elbow and looked down to see the smile of my small beggar friend looking up at me. She

nodded her head toward the street, indicating that she would take me across. Together, we moved

slowly into the chaos.

    Then we moved on toward the sidewalk, where she pulled my face down to hers, kissed me on

both cheeks, and then left, still smiling and waving back to me.

Traveling in poorer nations, I have witnessed a variety of ways to deal with beggars. The most

common response of tourists faced with the poverty-stricken is to ignore them and focus their eyes

elsewhere. I have seen people push away an outstretched hand in angry annoyance. A few may drop

a few coins into the hand in a hurry, hoping that other ragged pursuers won't immediately appear on

the scene.

For many reasons, giving money is not the best response to an outstretched hand. Many world

travelers have discovered that the greatest gift they can give is their time and respect. Everyone needs

recognition, to be seen as worthy of being known, to feel appreciated and loved. And I believe that

everyone is worthy and worth knowing.

1. The woman beggars helped the author go across the busy street because __________.

A. the author gave her material assistance  

B. the author treated her kindly and friendly

C. the author would help her as a reward  

D. the author was a foreigner

2. From the story, what position of the beggars in the author's mind might be?

A. equal    

B. superior      

C. lower    

D. valuable

3. In common cases, people will do the following things to the beggars EXCEPT for ________.

A. pretending to see nothing            

B. handing out some money

C. refusing them angrily               

D. greeting them normally

4. According to the author, the most important things beggars really need are _________.

A. mercy and pity

B. money and food  

C. smile and greeting  

D. attention and respect

5. The purpose of the passage is to _________.

A. show how poor the beggars are in Vietnam

B. offer some advice on dealing with begging

C. express what we should offer the beggars

D. describe an experience with a beggar

提睾反射中枢在（）

A.T10～T12

B.L1～L2

C.L2～L4

D.S1～S2

E.S4～S5

从中古四声（平声、上声、去声、入声）到普通话的四声（阴平、阳平、上声、去声），声调变化的规律是怎样的？

合理且无歧许可是世界范围内处理标准化中知识产权问题的使用规则。