肝脏的血液供应来自门静脉的约占（）。 A.30～35% B.40～45% C.50～

血吸虫在机体发生免疫逃避的机制是()

A．抗原伪装

B．刺激封闭抗体产生

C．引起免疫抑制

D．寄生于肌肉中

E．以宿主同源性

用所给动词的正确形式完成短文，并将答案依次填在短文中相应的横线上。

Dear Zhang Lin ,

    How's it going? I    1    ( have ) some problems at school. I find it difficult to work in the evening and I can't concentrate on anything at the moment. I spend most of my time   2   ( listen) to records or watching TV instead of doing my homework. The other students in my class __3   ( be ) much better than me. I have the following problems as well.I can't always take down the important things my teacher   4   (say) , because I write too slowly. She   5   ( tell ) me that I'm falling behind my class mates in my studies. I'm not good at  _6   ( write )and I usually hand in my homework late because I won't do it until the last minute. So I often have to find different excuses _7   ( let ) my teacher know why I haven't done the homework. I'm sure I _8   ( get) through my final exam in January.I'm now so far behind the other students that I don't know how I can   9    ( catch ) up with them.Last week, when my teacher _10   ( help ) me with my homework , she. found so many mistakes , which made me more upset.

    Could you please give me some good suggestions?

                                                                                                                                      Yours ,

                                                                                                                                           Wei Hua

我行开展银保通业务，根据协议约定，保险分公司定期将代理手续费划付各分行，各分行依据银保通系统提供的销售保费总额报表核对手续费金额无误后，办理手续费入账。

必须拆卸泵焊接、铆接、密封连接、过盈连接等固定连接件的拆卸方法是（）。

A.破坏拆卸法

B.拉拔法

C.顶压法

D.温差法

6个伸长节间的品种最上3个发根节位的发根期处于（）。

A.倒6叶至倒2叶期；

B.倒5叶至倒1叶期；

C.倒4叶至孕穗期；

D.倒3叶至抽穗期；