16．聽下面一段短文，完成16～20題．
16．How long has Mr White lived in Hill Town？
A．For the last three years．
B．Since he was a child．
C．All his life．
17．What did many tourists once do？
A．They boated on the river in the town．
B．They went camping on the hills in the town．
C．They visited the wildlife park in the town．
18．How is the factory polluting the environment？
A．By producing too much smoke．
B．By putting waste into the river．
C．By leaving rubbish on the roads．
19．What can't people there do？
A．Having any fresh，clean air．
B．Walk along the river．
C．See the bottom （底部） of the river．
20．Why did Mr White write this letter？
A．To ask for help to stop the factory polluting the town．
B．To tell people to stay away from the factory．
C．To call people to stop air pollution．
分析 略
解答 16．C 17．A 18．B 19．C 20．A
點(diǎn)評(píng) 略
