通过物流活动将商品由低价值区转到高价值区，所获得的价值差是( )。A．空间价值 B．

In the past twenty years, riding bicycles has become more and more popular among people of all ages. (83) Bicycles have long played an important part in the lives of American young people. But today an even greater number of adults cycle along roadsides and bicycle paths. These new riders are often trying to become fit or lose weight. They have found that bicycling is a pleasant way to stay healthy.

This is certainly good for health. But it has also brought some problems. With all these added people on the road, bicycle safety has become a matter of real importance.

Bicycle safety is mostly a matter of common sense. People should ride only on bicycle paths where they will not be badly hurt. There are also a number of rules that riders should follow, especially when riding on streets or highways. Bicyclists should never ride against the traffic, nor should they carry other people on their bicycles. They are also supposed to ride in single line on busy streets and to walk bicycles across the busy intersections (交叉路口) . (84)By following these rules, bicycle riders will not only stay healthy but also be safe.

In one recent year, the National Safety Council reported that 34 thousand bicycle riders were hurt in highway accidents. In that same year, another six hundred riders were killed. Since the introduction of crash helmets (头盔) in 1980, the number of injuries (伤者) and deaths from bicycling accidents had gone down. Today, more and more riders realize the dangers of bicycling. They are wearing helmets and paying closer attention to cycling rules.

根据短文内容回答下列问题。

小题1:How many rules should the riders follow? Give one example.

小题2:According to the National Safety Council’s report, what’s the total number of injuries and deaths in one recent year?

B. 将短文中划线部分译成汉语。

小题3:                                                                          

小题4:                                                                       

C. 请给短文拟一个适当的英文标题。

小题5:                                    

封闭在气缸内一定质量的气体，如果保持气体体积不变，当温度升高时，以下说法正确的是（ ）

A．气体的密度增大

B．气体的压强增大

C．气体分子的平均动能减小

D．每秒撞击单位面积器壁的气体分子数增多

下列关于老年人用药的说法错误的是（　）

A．老年人血浆白蛋白与药物结合能力低

B．老年人肝药酶的合成减少，药物半衰期延长

C．老年人药物吸收增多、脂肪组织增加、分布容积增大

D．老年人肾单位减少，肾脏灌注减少，均影响药物排泄

E．老年人使用经肾排泄的常量药物时，就容易蓄积中毒

铁路支座砂浆灌注时，支撑垫石顶面应进行（）等处理。

A、收光

B、清理干净

C、凿毛

D、湿润

E、修补

在泉州一带，沿海居民一般以下列哪种石材做为建筑材料，构成了泉州沿海民居住宅的独特风貌：（）

A、花岗岩

B、大理岩

C、玄武岩

D、砾岩