19．Getting caught in a traffic jam can be one of the most depressing things about traveling around a busy city．Now engineers in China have come up with a solution that could reduce traffic．
"Batie"，an elevated bus that is 4.8meters high and 7.8meters wide，allowing it to travel over vehicles （such as cars，buses，or trucks） with a height of less than 2meters．holds passengers on its upper level and lets traffic pass under it，made its first test run on Aug 2in Qinhuangdao，Hebei province．
It can cut down on traffic greatly and therefore reduce the country's increasingly worrying air pollution，the developers of the TEB told The Week．
It is also expected to save costs compared with other public transportation （交通运输） like the subway．"Able to carry 1，200people at a time，the TEB has the same functions as the subway while its cost of construction is less than one fifth that of a subway"Bai Zhiming，the engineer in charge of the TEB project，said in a video interview with CCTV News．
While it has been said that the bus could be a solution to world's traffic problems，it has also caused criticism （批评） and doubt．
Yao Tao，head of the Nanjing Institute of City and Transport Planning，listed some other possible problems，including the fact that present traffic facilities （设施） and rules would have to be changed．
"Safety is the most important thing，"Liu Daizong，China transport program director at the World Resources Institute，told CNN．"How would cars drive and turn under the bus？If there were an accident，how would you move passengers and vehicles out from underneath？"
28．The underlined word"elevated"in the second paragraph probably means"B"．
A．strengthened
B．lifted
C．broadened
D．lengthened
29．Compared with other public transportation like the subway，the Batie is expected toD．
A．be faced with most safety problems
B．be most environmentally friendly
C．carry the most passengers
D．save more costs
30．What is the best title for the passage？A
A．A new bus makes its first test run．
B．A new bus solves traffic problems．
C．Experts share opinions on a new bus．
D．Advantages and disadvantages of a new bus．
31．Where can you most probably read this material？C
A．In a science book
B．In a magazine
C．On the Internet
D．In a newspaper．
