问题 单项选择题 A3/A4型题

特种蛋白免疫分析仪是基于抗原-抗体反应原理,不溶性免疫复合物可使溶液浊度改变,再通过浊度检测标本中微量物质的分析方法。

产生伪浊度的主要因素()

A.抗体的非特异性交叉反应性

B.增浊剂浓度过低

C.反应时间不合适

D.仪器故障

E.抗原过剩

答案

参考答案:A

阅读理解

阅读短文,在改写后的短文空白初填入一个适当的词,使其完整通顺。

     Most American businesses are open five days a week. American school children go to school five days

a week, too. American families usually have a two-day weekend. The weekend is Saturday and Sunday.

Over the weekend, people spend their time in many ways. Many families enjoy weekend together. They may

go shopping, go for a drive, or visit friends. They may also invite friends over and have a party at home. Many

families take part in sport during the weekend. Running, hiking, playing volleyball and swimming are popular

in summer. Skiing and skating are the favorite winter sports. Weekends are also a time for American families

to work on something in their yards or in the house. Many families plant flowers and have vegetable gardens.

Some families spend the weekends to paint or repair their houses. For most Americans, weekend are very busy.

     Most Americans    1    five days a week and they have a two-day    2   The people of many families spend

their time in different    3  . They may go out to see their friends or   4    friends to come to have a party at

home. Over the weekend, many people are interested in    5   , some of them like to go   6    in summer and 

  7    in winter. Some families   8    with their flowers and    9   in their gardens. The others are busy   10  

 or repairing their houses at the weekends.

1._____ 2._____ 3._____ 4._____ 5._____ 6._____ 7._____ 8._____ 9._____ 10._____

问答题 简答题