The bicycle is one of the simplest yet most useful inventions in the word．What is the    1  surprising is that it was not invented 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．In this way, the situation（局势）is made more serious。  9  the best way to make riding safer and more popular is to create paths（路）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 using their bicycles．

1．A．many                       B．more                   C．much                     D． most

2．A，before                     B．when                   C．since                     D．until

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

4．A．world                      B．countries              C．1and                      D．earth

5．A．1uck                     B．glad                     C．sorry                     D．tired

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

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

8．A．by                         B．in                        C．use                        D．drive

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

10．A．it                         B．them                    C．us                         D．that