As everyone knows, there are many 　16　 of transportation in the world, like bicycles, buses, ships, trains and 　17　 .
If you are in big  18　like Shanghai or Beijing, maybe you get to school   19  a subway or you have to 　20　 to school because you live in a mountain village. Here I am just trying to say something about　21　 .
Ten years　22　, bicycles were very　23　in most villages.  24　 family had one or two of bicycles. Children got to school by bicycle; 　25　 rode bicycles to go shopping. Then motorcycles (摩托车)   26  to become popular. People no longer rode bicycles because motorcycles ran   27  faster.  But now, in some countries，bicycles are highly suggested
  28  the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles   29  . So, to live a low-carbon life,   30  a bike is a good way.

1.If you want to get a good sleep, you'd better _______.

A．go to bed after you're tried                B．go to sleep at midnight

C．follow the bedtime routine                D．eat something or read in bed

2.You should visit the dentist at least once a year because_______.

A．the oral examination is necessary           B．you don't often brush your teeth

C．some diseases may be in the mirror         D．you don't have a good night's sleep

3.Studies have shown that many diseases have something to do with_______.

A．having no oral examination                B．washing hands with cold water

C．sleeping too late sometimes               D．doing little physical activity

4.When you want to learn more about the flu, you can_______.

A．visit www.mydr.com.au                   B．call Health Line at 1800-848-1313

C．visit the dentist in your place               D．call Health Line at 1800-438-2000