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问题 多项选择题

下述与自身免疫病的发生有关的是（）。

A.隐蔽抗原的释放

B.某些与自身组织成分具有共同抗原性的微生物感染

C.自身组织或器官MHCⅠ类抗原的异常表达

D.长期使用广谱抗生素

E.机体免疫系统功能失常

答案

参考答案：A, B, C, E

解析：自身免疫发生的机制，不包括长期应用抗生素。

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                                                                       CONTEST
     No purchase is necessary and a purchase won't increase your chances of winning.
SPONSOR(主办方)
     Sponsor is National Geographic Society, 1145 17th Street, N.W., Washington, D.C. 20036-4688
TERM
     The Ocean Flag Contest begins November 1, 2010 and ends February 20, 2011. Entries must be postmarked by February 20, 2011 and received by February 26, 2011. Entries become the property of
Sponsor and won't be returned.
     The Contest consists of the stages presented below, as described fully in these Official Rules.
     Stage
     Starts
Ends
Submission(递呈)
Nov.1, 2010
Feb.20, 2011
Judging
On or about Feb.26, 2011
On or about March 15, 2011
Voting
On or about March 22, 2011
At 11:59 p.m. April 05, 2011
WHO MAY ENTER
     The Contest is open only to legal citizens of the United States who are eight to fourteen years of age.
Employees of Sponsor and their immediate family members, regardless of where they live, aren't allowed
to enter or win a prize. Entrants(参赛者) must have a parent's permission to enter.
HOW TO ENTER
     To enter, go to our website to download and print an entry form. Complete the form with your name,
address, telephone number, email address (if available), date of birth, and parent's signature. Mail your
completed entry form, Flag Design, and Essay. Entry must agree with the following requirements:
     ● Create a design for a flag on plain paper. The Flag Design must represent ocean exploration and the
     protection of ocean ecosystems.
     ●Write an essay, not more than 250 words in length describing what inspired your design.
     ●The Flag Design and Essay must each be a single work of original material created by the contest
     entrant. No other party has any right, title, claim or interest in the Flag Design or the Essay.
     Changing or improving a third party's pre-existing work doesn't qualify as entrant's original creation.
Limit one entry per person.
1. According to the passage, the entries must be posted _____.                
A. before Nov. 1, 2010                                              
B. before Feb. 20, 2011                                                        
C. before Feb. 26, 2011                                              
D. before Mar. 22, 2011                                                        
2. The contest is intended for ______.                                        
A. the employees of Sponsor                                                 
B. 8 to 14-year-olds of the US                                                
C. legal citizens of Washington, D.C.                                      
D. the family members of Sponsor                                              
3. The main purpose of the Contest is to ______.                              
A. improve kids' painting skills                                        
B. develop kids' sense of competing fairly                                    
C. improve kids' communication skills                                    
D. develop kids' sense of protecting the ocean                                
4. It can be inferred that once the entrants post their work, they ______.    
A. can share it with other entrants                                      
B. can not contribute it to any other party                                    
C. can exchange it with other entrants                                    
D. can not improve it with any other party                                    
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判断题

职业证书并非多多益善，大学生应结合自己的职业规划，考取具有竞争力的执业证书。
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