紫外分光光度法测定醋酸地塞米松含量时的具体方法是A．对照品对比法B．百分吸收系数法C

甲、乙、丙3个公司，甲公司的员工比乙公司多15%，乙公司的员工比丙公司多25%，而甲公司比丙公司多91名员工，丙公司有员工( )。

A．180人

B．200人

C．204人

D．208人

E．210人

阅读理解

     It is surprising that eating three meals a day-breakfast, lunch and dinner-has been a custom(习俗) only since 1890.  Before this time, people only had two meals a day-breakfast and dinner.  

     In the 16th century, breakfast was only to break one's fast(随便吃一点). But 200 years later it had

become a large meal, not just for family, but for numbers of guests as well. It was a social(社会的)event.  It began at 10 a.m.  and lasted until 1 p.m. Then breakfast began to be less popular.  It became,

instead, a lighter meal and was taken at a much earlier hour.  By 1850 it had been pushed back to 8 a.m.  and became a family meal.

     Dinner, however, went to the other way. In the 16th century it was eaten at 11 a. m. Years later, it

had moved to the early afternoon, then to 5 p.m. By 1850 dinner time had reached 7 p.m. Lunch is a

recent idea. It first appeared as a snack to fill the gap(间隙) between breakfast and dinner.  

1. People did not have lunch                      .  

A. until 1890        

B. after 1890      

C. since 1890      

D. by 1890

2. " Dinner, however, went to the other way " means "                  ".

A. Dinner didn't go there with breakfast  

B. Dinner took the same way with breakfast

C. Dinner is different from breakfast    

D. Dinner is the same with breakfast

3. Breakfast became a family meal since the                   century.  

A. 17th    

B. 18th    

C. 16th    

D. 19th

4. The passage is mostly concerned with(涉及)                  .

A. what people eat for breakfast      

B. what people eat for dinner

C. the history of supper              

D. the history of the three meals

通信建设工程概、预算应以单位工程为单位进行编制。

成就星巴克今日辉煌的重要人物是（）。

A.毕特

B.霍华德·舒尔茨

C.西格尔

D.努森

薄层色谱法分离生物碱类药物常采用的条件是（）。

A．硅胶C板加EDTA

B．硅胶C板加酸性磷酸盐

C．展开剂中加二乙胺等有机碱

D．展开剂中加枸橼酸

E．在酸性系统中进行