支气管扩张

The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not ___1__ earlier, although the great inventor Leonardo Da Vinci had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced___2___ long after he died.
　　A person riding a bicycle uses ___3___ energy to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed ____4___, most people don’t travel to work by bicycle. It is not because the bicycles are expensive or people feel___5____ if they ride to work. It’s because __6___ cars on the roads becomes larger. It certainly becomes ___7___ to ride a bicycle. As a result, more people put their bicycles away and go to work ___8___ their cars , and in this way, the situation is made more serious.___9___ the best way to make riding safer and more popular is to create paths (开设通道) only for bicycles, and to make ___10___ so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles.

小题1:	A．invent B．inventing C．invented D．to invent

小题2:	A．before B．when C．since D．until

小题3:	A．much B．quite a lot of C．very little D．many

小题4:	A．world B．countries C．land D．earth

小题5:	A．lucky B．glad C．sorry D．tired

小题6:	A．the number of B．a number of C．this kind of D．all kinds of

小题7:	A．safer B．more dangerous C．much dangerous D．safe

小题8:	A．by B．in C．use D．drive

小题9:	A．Hardly B．May be C．Perhaps D．Nearly

小题10:

A．it B．them C．us D．that