Electric bicycles which run on battery-operated (电瓶) motors are winning over riders of ordinary bikes   41 their speed, quality and environmental advantage.
They were first   42 on 1980s in China, but the selling was not very good. Today, thanks 43  improvements on battery quality, the electric bikes sell well. There are now more than 100 electric bicycle producers in China and 26 million such bicycles were produced in 2011. Japan is another large  44  of such bicycles in the world with a total production reaching 381,721in 2010.
  45 China is one of the largest producers of electric bicycles in the world, the   46  of its producers with mass production (大批量生产) is actually small.
Electric bicycles are still   47 in China. Time is needed for people to become familiar with them and accept them. Each bike’s price of between 2,000 yuan (US $318) and 3,000 yuan (US $477) is still  48  for ordinary citizens (民众). Although such bikes are quick, safe and 49 to operate, their batteries still have shortcomings (不足). They weigh more than 10 kilograms; their service life is   50  two years and they   51  400 yuan each.
There were more than 450 million bikes in China in 2006. If just one percent of all these bikes are replaced by electric  52  , the market will be very large. And   53  the battery is further improved and the price is    54   , many of us will not be able to keep back from    55  the latest electric bikes

Electric bicycles which run on battery-operated (电瓶) motors are winning over riders of ordinary bikes   41  their speed, quality and environmental advantage.

   They were first   42  on 1980s in China, but the selling was not very good. Today, thanks  43   improvements on battery quality, the electric bikes sell well. There are now more than 100 electric bicycle producers in China and 26 million such bicycles were produced in 2011. Japan is another large  44   of such bicycles in the world with a total production reaching 381,721in 2010.

      45  China is one of the largest producers of electric bicycles in the world, the   46   of its producers with mass production (大批量生产) is actually small.

Electric bicycles are still   47  in China. Time is needed for people to become familiar with them and accept them. Each bike’s price of between 2,000 yuan (US $318) and 3,000 yuan (US $477) is still   48   for ordinary citizens (民众). Although such bikes are quick, safe and  49  to operate, their batteries still have shortcomings (不足). They weigh more than 10 kilograms; their service life is   50   two years and they   51   400 yuan each.

There were more than 450 million bikes in China in 2006. If just one percent of all these bikes are replaced by electric  52   , the market will be very large. And   53   the battery is further improved and the price is    54    , many of us will not be able to keep back from    55   the latest electric bikes

1.A. because of   B. because   C. towards   D. at

2.A. build   B. built   C. building   D. to build

3.A. for  B. in   C. by   D. to

4.A. producer   B. production   C. produce   D. to produce

5.A. But   B. If    C. Although    D. When

6.A. buyer   B. number   C. price   D. owner     

7.A. old   B. tall   C. new    D. short

8.A. small   B. large   C. expensive   D. high

9.A. easy    B. difficult    C. hard    D. easily

10.A. other than  B. more than    C. over    D. less than

11.A. spend    B. cost    C. take    D. make

12.A. cars    B. bike    C. ones    D. one 

13.A. where     B. unless   C. whether    D. if

14.A. increased    B. raised    C. reduced    D. lifted

15.A. buying     B. brought    C. to buy     D. buy

It was Sunday afternoon. My brother and I were alone at home. My parents went for a party and asked me to look after my brother. I was doing my homework while my younger brother was watching TV. Suddenly the doorbell rang. Ding-Dong! My brother thought that it was our parents, so he opened the ________soon.

 A tall man wearing a black raincoat stood outside. He said that he came to sell books and asked politely__________ our parents were at home.

Without thinking, my brother said,“No.” Then the man asked if we would like to ______some story books. I refused him. When I wanted to close the door, he suddenly pushed the door very _______and came into our house. He took out a ________and ordered me to tie up my brother’s hands with a rope. I tied up his hands in a special way so my brother could untie ______easily. The man then tied my hands up and locked _______of us in the kitchen. Soon, he went upstairs to _________money. I taught my brother to untie the rope on his ______. He then untied me. I rushed to the telephone to call the police, ______the line was dead. The doors were all locked from the outside. It was lucky that the man ______to lock the kitchen window. We got out of the house through the kitchen window and went to the _______ pay phone to call the police

Soon _______came to our house and the man was caught. By that time, my parents had come home. We told them the whole story. My parents were ______that we were not hurt. They told me that I should stop my brother from _______the door to strangers. I learned a lesson on safety.

1.A. window        B. door           C. book             D. fridge

2.A. if             B. why           C. when             D. how

3.A. lend           B. borrow         C. sell              D. buy

4.A. politely        B. slowly          C. hard.             D. quietly

5.A. book          B. knife           C. gift              D. pen

6.A. himself        B. myself          C. herself           D. themselves

7.A. none          B. neither          C. both             D. all

8.A. look at        B.look after       C. look like          D. look for

9.A. feet           B. hands           C. neck             D. legs

10.A. and           B. so             C. or               D. but

11.A. wanted        B. remembered     C. forgot            D. tried

12.A. farthest        B. nearest         C. largest           D. smallest

13.A. my friends      B. the police      C. the neighbors      D. my parents

14.A. glad           B. angry         C. sad               D. sorry

15.A. cleaning        B. closing        C. locking           D. opening