食管上段异物伴吞咽困难者，检查常可见（） A.梨状窝积液 B.致命性出血 C.X线显

     Have you heard of "car sharing"? The idea of "car sharing" is becoming more    1_  in Europe and
the USA . "Car sharing" is that people    2_   together in the same car to work, instead of driving their
own cars.     
     On average we drive our cars only one hour per day. The rest of the time we   3   park our cars in
parking places and we have to    _4   too much money for parking our cars in the city. To save money
and help the environment, people have    _5   to share cars more and more.  
  "Car sharing" is a good way for us to save money , time, and help the environment at the same time.
It's changing the way that people are thinking about transportation. What a great idea!