33．（9分）

（1）                                                                  

（2）                                                                   

（3）                                                    

（4）②                                                        

③                                                        

结论：                                                                    

2009届高三年级第三次模拟试卷

生物试题答案

1-5 CCACD    6-10  ABBBC  11-15 BDBCD  16-20 ACDAB

21 ABD   22 BD  23 AB  24 ABCD  25 AD