利用一台机械做功时，有用功为60J，额外功为20J，则机械效率为______．

Jackson was driving back home along a road one evening. He just lost his job. It was winter and it was very cold, just like his feelings.

An old lady with her car was standing on one side of the road. She needed help. No one stopped to help her. Jackson stopped in front of her and got out of his car. The lady looked very worried. Even when he put a smile on his face, the old lady still looked worried. Was he going to hurt her? He didn't look safe, and he looked poor and hungry.

Jackson knew how she felt. He said." I'm here to help you, madam. Why don't you wait in my car? By the way, my name is Jackson."

The lady thought for a while and then went into his car. There was something wrong with her car. Jackson went under her car to repair it. When he finished, he got dirty and his hands hurt. Then the lady told him that her name was Anie. She asked Jackson how much she should pay for his help.

Jackson never thought about getting money. This was not a job to him. This was helping i someone in need. He told her that if she really wanted to pay him back, the next time she saw someone who needed help, she should give that person help.

小题1:Jackson felt      when he drove home that evening.

A. strange         B. happy      C. sad

小题2:Why did the lady look worried?

A. Because she lost her way.        B. Because her car broke down.

C. Because she felt very cold.

小题3: It was     for Jackson to repair the lady's car.

A. difficult        B. interesting       C. impossible

小题4:Jackson helped the lady because      .

A. the lady would pay him          

B. the lady felt cold

C. he wanted to help someone in need

小题5:The old lady should     the next time she met someone who needed help.

A. help that person            

B. leave that person alone

C. call Jackson for help again

属于我国法定传染病中甲类传染病的是（）

A.伤寒

B.痢疾

C.霍乱

D.流感

E.结核

首字母填空。根据短文大意和首字母提示填空（每词1分，计10分）

Mr King taught English in a middle school.  He was very  b___小题1:___  all  the time  and couldn’t do some r__小题2:__  .So he left the school and  opened  a bookshop in  the  c__小题3:___  of  the  town.  It  wasn’t  big enough but all  the books were nice  and  most people  liked to  buy  some  there. When  the  shop was c_小题4:__  ,he could  read  at  home. He knew  a  lot and  the  learned （有学问的） people  were  glad  to  make  f__小题5:___ with  him .

It was Sunday and it was cold outside .Mr King was  very  busy. At nine  in  the  evening  all  the  buyers  left  e__小题6:___ a  girl.  She  was  dressed   up  and waited  for  s_小题7:___ there. Standing  by  the  shelves,  she  looked  over  the  books  one  after  a__小题8:__ . It  made them  in  a  fearful mess(凌乱不堪).Mr  King  came  up  to  her  and  asked, “ Excuse  me , madam. What  can  I  do  for  you?” “Your  books  are  all  dull(乏味的),”said  the  girl,“I  want  a  d_小题9:___  one.”“That＇s  easy,”  Mr  King smiled .  He  t_小题10:__  out  a  cookbook (烹饪书) and  said, “Here  you  are ,madam.”

动物细胞生理活动所需要的能量来自 [ ]

A．叶绿体

B．线粒体

C．液泡

D．细胞核

隔膜泵的流量特性是指介质流过阀门的（）与位移间的关系.