The World's Worst Traffic If we travel in big cities， it's very likely that we will come across traffic jams， which often make us complain （抱怨）． But people in Bangkok， Thailand， have more to complain about． This is because Bangkok has the worst evening rush hour traffic in the world， according to a GPS company in Europe． Each year， the company will work out a list of the world's most congested （拥堵的） cities． The results are based on statistics （数据） of 390cities across the world． This year， Chinese cities Chongqing and Zhuhai are also on the list． The list aims to help drivers and cities understand the traffic trends （趋势） and take actions to improve the bad traffic．

Teens Artist Tries to Solve the Smog Problem

Beijing is a city often covered with smog． Many people are looking for ways to solve it． A Dutch artist has made a tower that takes in smog and gives off clean air． This tower is 7meters tall and is the biggest air cleaner in the world， according to Chinanew．com． It can clean the air in an area the size of a soccer field in 36hours． Beijing has been testing the tower since January． But some experts don't think this tower can truly work． It's more of an art piece to raise people's awareness （意识） of air protection， they said． People will know if the tower works when the results come out．Teens

46． Who comes up with the idea of building the tower？　　

A． An artist．

B． A scientist．

C． An expert．

D． Chinanew．com．

47． Some experts think the tower　　．

A． really works well

B． needs more tests

C． is like a soccer field

D． is more of an art piece

48． According to Passage 2，　　is the city with the worst traffic this year．

A． Bangkok

B． Chongqing    

C． Zhuhai   

D． Beijing

49． The list in Passage 2mainly aims to　　．

A． offer statistics   

B． describe the traffic in Thailand

C． help cities better their traffic

D． call on people to ride bikes

50． The passages above are　　．

A． posters  

B． ads

C． news  

D． notices