精子到达受精部位的第一道拦筛是（）。

When Elizabeth Kenny was a little girl, she fell off a horse and hurt her arm. Mrs. Kenny took her to a doctor in Toowoomba, Queensland. In the doctor’s, Elizabeth saw many bottles of medicine standing in a row. Since then, she wanted to be a nurse. As soon as she was old enough, Elizabeth was trained in a hospital. After working for some time, she made a surprising discovery. Among her patients were some children who had lost the use of their legs because of polio ( 小儿麻痹症) . Kenny tried putting hot cloth on their legs and washing them in a special way. The results were great. The children were able to use their legs again.

　　Most doctors would not believe that children could get well in such a simple way. Gradually, however, she became famous. From 1993 on people from many parts of the world brought their children to Australia to receive treatment by this wonderful nurse. She was invited to America where her methods were used in many hospitals. Money was collected to build Kenny foundations which were for polio patients. Kenny died in 1952, but she will long be remembered for her fight against polio.

小题1:Toowoomba is the name of _____.

A．a famous doctor

B．a kind of disease

C．an Australian city

D．an Australian school小题2:The children who suffered from polio ____.

A．couldn’t walk

B．couldn‘t work

C．couldn’t speak

D．lost their legs小题3:What was Kenny‘s surprising discovery?

A．there were so many polio patients around her.

B．Polio children could recover in a simple way.

C．Children suffering from polio had refused to use arms

D．Among the children some of them suffered from polio.小题4:The best title (标题) of the text is most likely to be ____.

A．Methods of Treating Polio

B．Kenny Foundations for Children

C．Elizabeth Kenny, the Wonderful Nurse

D．Hospitals for Polio Patients

电子是带有最小负电的粒子，人们已经知道这个最小电荷量为1.6×10^-19C，并把它称为元电荷．请你算一算，______个电子所带的电荷量等于1C．

中等强度的动机有利于问题的解决。

商业银行风险管理的主要策略中，可以降低系统性风险的有（）。

A.风险转移

B.投资组合

C.风险分散

D.风险规避

E.风险补偿

下列哪项不是总分类账户与明细账分类账户的平行登记要点( )

A．依据相同

B．方向相同

C．金额相等

D．账簿相同