哪项不是散发性甲状腺功能减低症的病因 A．胚胎期碘缺乏 B．甲状腺组织缺如 C．促甲

食品放在冰箱中能保存一定的时间不腐败，主要是因为在冰箱的环境中（　　）

A．没有细菌

B．细菌被冻死了

C．细菌繁殖的速度很慢

D．细菌很少

找出下列句子中错误的一项，将序号填在括号里。

( ) 1. How long is Shanghai from Beijing?    

               A     B            C        D 

(     ) 2. It's four hour by ship.    

             A    B      C         D 

(     ) 3. Wuhan is know as "River City".    

                       A     B    C     D 

(     ) 4. There are also good food in Wuhan.    

                      A     B     C          D 

( ) 5. My box is bigger and heavier than your.    

                        A     B              C              D

安全技术知识教育包括生产技术、安全技术两个层次的教育。

Man: Just think I went through so much work on my paper only to get a Ｃ.Woman: Well, I don't think grades are everything. What you've learned in the process will prove useful in your future work.Question: What does the woman imply

A．The man should work harder to improve his grades.

B．The man will benefit from the effort he's put in.

C．It serves the man right to get a poor grade.

D．It was unfair of the teacher to give the man a Ｃ.