用树形结构表示实体之间联系的模型是______。A．关系模型 B．网状模型 C．

公安机关在侦查案件时，对能够证实犯罪嫌疑人有罪的证据应当收集，对能够证实犯罪嫌疑人无罪的证据则不应当收集。

铁路货物运输作业与单证流转过程为：（）。

A.托运手续（托运单）→付运杂费（货票）→货主提货（发票）

B.订立托运合同（运输合同）→托运程序（托运单）→装车（押运单）→付费（货票）→承运（运单）→到货

C.申请车皮计划（货运计划表）→托运（托运单）→付运杂费（货票）→承运（托运单）→到货通知（货票）

D.申请运输计划（计划表）→托运程序（托运单）→办理付费（货票）→到货通知（提货单）

阅读理解。

     When I was small and my grandmother died, I couldn't understand why I had no tears. But that night

when my dad tried to cheer me up, my laugh turned into crying.

     So it came as no surprise to learn that researchers believe crying and laughing come from the same

part of the brain. Just as laughing has many health advantages, scientists are discovering that so, too,

does crying.

   Whatever it takes for us to reduce pressure is important to our emotional (情感的) health, and crying

seems to study found that 85 percent of women and 73 percent of men report feeling better after crying.

   Besides, tears attract help from other people. Researchers agree that when we cry, people around us

become kinder and friendly and they are more ready to provide support and comfort. Tears also enable

us to understand our emotions better; sometimes we don't even know we' re very sad until we cry. We

learn about our emotions through Crying, and then we can deal with them.

   Just as crying can be healthy, not crying - holding back tears of anger, pain or suffering - can be bad

for physical (身体的) health, Studies have shown that too much control of emotions can lead to high

blood pressure, heart problems and some other illnesses. If you have a health problem, doctors will

certainly not ask you to cry. But when you feel like crying, don't fight it. It's a natural -and

healthy-emotional response (反应).

1. Why didn't the author cry when her grandmother died?

A. Because her father did not --ant her to feel too sad.

B. Because she did not love her grandmother.

C. Because she was too shy to cry at that time.   

D. Tie author doesn't give the explanation.

2. According to the author, which of the following statements is true? 

A. Crying is the best way to get help from others.

B. Fighting back tears may cause some health problems.

C. We will never know our deep feelings unless we cry.

D. We must cry if we want to reduce pressure.

3. What might be the most suitable title for the text?

A. Power of Tears              

B. How to Keep Healthy

C. Why We Cry                

D. A New Scientific Discovery

洛氏硬度值是根据压头压入被测定材料的压痕深度得出。

工程项目合同的特点有( )。

A．工程项目合同是一个合同群体

B．合同的标的物与一般的产品合同相同

C．合同内容庞杂

D．工程项目合同主体只能是法人

E．工程项目具有较强的国家管理性