根据短文内容，从A、B、C、D、E中选出最适合放入短文空缺处的选项，并将序号及相应答案写在答题纸上。选项中有一项是多余选项。

Jogging (慢跑) is basically running at a steady (平稳的) speed over short or long distances. It has become popular some twenty years and remained a favorite way of keeping fit for lots of people．

        People jog around college campuses, in parks, in the countryside and even in urban areas. Special courts, fields and running tracks are not necessary. Similarly, no special equipment is required — no costly hats, or balls, and no expensive sports kit. Good quality running shoes are advisable, but otherwise the jogger can simply wear loose, comfortable clothing.

        It’s not unusual to see joggers exercising in the height of summer or in the depth of winter! Jogging is a solo (单独的) sport. You don’t need to wait until you have formed a team or found a partner. You can jog alone. A few words of warning, however: lone female joggers should be especially careful to choose sensible jogging routes, particularly at night time.

        You just need to be basically healthy and after basic warming up, you are ready to begin. You simply start running, gently, and then build up to a steady pace. Do not overtire yourself by trying to go too fast. A steady, comfortable pace is your aim．

    It’s good for the lungs, the heart and the circulation (循环). It’s easy and it’s convenient. Why don’t you try it? If you require more information, talk to one of the instructors at the sports centre. We are only too happy to help. Please remember: if you do decide to jog, talk to your doctor first if you have any health worries. Happy jogging!

A. Jogging is excellent for keeping fit.

B. That’s the reason why people like jogging.

C. The act of jogging doesn’t need any special training or skill.

D. One of the main advantages of jogging is that it can be done anywhere.

E. In addition to being able to jog anywhere, you can also jog at any time, in any season!

If we say the four great inventions (Gunpowder,Compass,Paper and Art of Printing) reflected ancient China’s scientific achievements,then Zhaozhou Stone Bridge perfectly represented one of the greatest contributions to ancient China’s bridge building.Nobody was unfamiliar with the stone bridge full of legends and vivid folk stories.

The ancient Zhaozhou stone bridge started to be built in 590 during the Sui Dynasty (581～618) and established in 608.The pioneer for building the bridge was Li Chun who overcame unimaginable difficulties,undergoing all hardships.The location of the bridge is in Zhao County south,Hebei Province.It lay across the Xiaoshui River,far away from the mountains that provided rocky materials.In ancient times,it was such a busy,deep and wide river that could be used as an important carriage to transport heavy rocks and other materials.As we know,no train,no lifting machine could be used to move granite(花岗岩)blocks to the construction site.As an intelligent stonemason and engineer,Li Chun worked out his plan and design all from his own direct observation and investigation.It took his whole life-time in completing the great historical project inChina.Nowadays it is not only a historical remarkable model of architecture,but also a brilliant Chinese cultural crystallization(结晶) of wisdom.

The entire length of the bridge is 50.82 meters with 10 meters width.The whole stone bridge looks like a big bow,the span of which is 37.02 meters,and its height from the top to the surface of water at a regular position is 7.23 meters.The bridge arch seems to be moving smoothly and flatly.The whole arch consists of 28 big granite blocks connected each other tightly together.On both end sides of the general arch there are 4 smaller arches,2 of which on one side,the other 2 on the other side.The smaller arches could be used to decrease the weight of the bridge and save stone materials,and help flood get through easily,which seems to be much prettier.Such a hard-thinking and careful consideration of the engineering article is really a model of design and layout.The span was much wider than the other stone bridge in ancient times all over China.

Today Zhaozhou Stone Bridge is one of international cultural relics and perfectly protected and preserved by the concerned administration of China.

The best title of this passage is _________.

A.Great engineer in ancient China                      B.Zhaozhou stone bridge

C.Four great inventions                                     D.How to build a bridge

The third paragraph mainly tells us _________.

A.the materials of Zhaozhou bridge                    B.the structure of Zhaozhou bridge

C.the arches of Zhaozhou bridge                        D.the importance of Zhaozhou bridge

The underlined word “carriage” probably refers to _________.

A.cart                          B.transport                   C.channel                     D.resourse

Comrade Li Dazhao, _____ librarian of Beijing University, was one of the founders of the Chinese Communist Party.

　　A. sometimes B. sometime  C. some time  D. some times

What do you do if you are hit in the mouth and one of your teeth is knocked out? A dentist(牙医)may be able to put the tooth back in for you, but you have to get to the dentist first．In the meantime, you have to store the tooth so that it will stay healthy．

The simplest thing to do is put the tooth back into your mouth, or you could put it in milk．Frank Courts, a dentist at the University of Florida, worked with other researchers to find the safest way of keeping knocked-out teeth．He tried putting teeth into milk, into water, and into cell-culture medium(细胞培养液)．He also tried, just drying the teeth in the open air．He used teeth that had to be removed from people’s mouths for various reasons．The teeth were put into one of the solutions(溶液)or stored in the air for one hour．Then cells from the root of the teeth were scraped-off the teeth．Dr．Courts and the others then studied how healthy these cells were．

The cell-culture medium worked best to keep a knocked-out tooth healthy outside the mouth．However, few people keep cell-culture medium handy at home or in school．

The next best thing was milk．But Dr．Courts said that the best thing of all was to wash the tooth and put it right back into its socket(牙槽)in the mouth．For some people, though, this is just too painful or upsetting．So milk will do, until you get your tooth (and your mouth)to a dentist．

This passage is mainly about              ．

A. how a dentist can save a knocked-out tooth

B. how to keep a knocked-out tooth healthy

C．how Dr．Courts and other researchers made their experiments

D．how to put a knocked-out tooth back into its socket

The best way to keep a knocked-out tooth healthy outside the mouth is to store it       .

A．in cell-culture medium    B．in milk     C．in water    D．in the open air

Milk can be used instead of cell-culture medium to put a knocked-out tooth in because     ．

A．milk works better to keep the tooth healthy  B．milk causes less pain

C．cell-culture medium is not usually handy    D．cell-culture medium is more expensive

“Dr．Courts said that the best of al1 was to wash the tooth and put it right back into its socket in the mouth．”In the sentence, the word “best” means              .

A．cheapest and healthiest                  B．least painful and cheapest

C．quickest and least painful                D．easiest and healthiest