下一代在形态、特征、生理等各方面与上代的一致性称为（）。A.变异 B.遗传 C.突变

阅读理解。

     Two men are walking in the park. One is Mr. Brown, a worker, the other is Mr. Black. Mr. Brown is

going to a chair. It is next to the road. Mr. Black is after him. Mr. Brown finds Mr. Black. Now Mr.Brown begins to walk faster. Because he wants to get to the chair before Mr. Black. Now Mr. Black begins to

walk faster because he also wants to get to the chair first. Then they both run. Mr. Black runs faster than Mr. Brown. So he gets to the chair first and sits down on it. Mr. Brown runs after Mr. Black. When he

gets to the chair, he sees Mr. Black sitting on it. He is sorry to show a notice (通知) with the words "Wet Paint (油漆未干)" to Mr. Black. Now Mr. Black knows why Mr. Brown is going to the chair.

1. Where are Mr. Brown and Mr. Black?

A. In the garden.                  

B. On the chair.

C. In the park.                    

D. Next to the road

2. What are they doing? They are ________.

A. talking                        

B. walking to the chair

C. holding a notice                  

D. sitting on a chair

3. ________ gets to the chair first?

A. The worker        

B. Mr. Black        

C. Mr. Brown          

D. A student

4. Mr. Brown is going to the chair because ________.

A. he wants to sit there                

B. he wants to talk to Mr. Black on the chair              

C. it is his chair                      

D. he wants to tell people “Wet Paint”

张某系公安人员。一日，他便装巡逻乘坐公共汽车，车上遇劫匪。张某见劫匪有五人，且均持有凶器，便担心自己的生命安全；所以来能站出来制止劫匪的行为；''致使多名旅客伤亡且财物被劫。张某的行为属于______。

A．正当防卫

B．紧急避险

C．不构成犯罪

D．犯罪行为

根据《建设工程质量管理条例》，工程在正常使用条件下，承包人对工程质量保修期限最低为2年的工程有（）。

A.基础设施工程

B.防水工程

C.设备安装工程

D.电气管线工程

E.给水管道工程

股票的三要素是（）、股份和（）。

建设工程施工项目开工前编制的工程测量控制方案应由（　 ）批准后实施。

A．项目经理

B．公司技术负责人

C．公司总工程师

D．项目技术负责人