职业道德不仅是从业人员在职业活动的行为标准和要求，而且是本行业对社会所承担的道德（）

证明二次函数f（x）=ax²+bx+c（a≠0）的两个零点在点（m，0）的两侧的充要条件是af（m）＜0．

Do you have a pen pal? If not, do you want to have one? Now let me tell you how to get a pen pal. There are usually three steps(步骤)The first is greeting. In this step, you and your new friend will say “hello” to each other and tell names. The second step is to talk. When talking with your new friend, it is always about your age, your family, your favorites or any other things like that. The third step is leave-taking. In this step, you tell your new friend that you are happy to meet him/her. You can also say “Do you want to be my pen pal?” or “ I hope we can be pen pals.”

小题1:This passage is about ______.

A. how to get a pen pal            

B. how to get to a hotel

C. how to learn a new language      

小题2:There are______steps mentioned(被提及)in the passage.

A. two    B. three           C.  four          

小题3:Which of the following is NOT a greeting?

A. Hi!         

B. Where are you going?   

C. Hello, my name is Jane.        

小题4:You may talk about your father’s favorite animals in the ____step.

A. first  B. second          C.  third     

小题5:What does “leave-taking” mean ?

A. Meeting your pen pal.         

B. Visiting your pen pal’s house.

C. Saying goodbye to your pen pal.   

促使欧洲人开辟新航路的根本原因是

A．希腊、罗马古典文化的复兴

B．封建文化的复兴

C．资产阶级文化的兴起

D．现代文化的兴起

芽胞、鞭毛、荚膜及异染颗粒等的染色需用什么染色法（）。

A.美蓝染色

B.革兰染色

C.抗酸染色

D.特殊染色

E.复红染色

如果一电子称能精确到0.001Kg，称一桶油的读数为3.864，则此桶油是（）公斤。

A、386.4

B、0.3864

C、3.864

D、38.64