单词拼写

1. I opened the door and a ____   her into the house.

2. London will h ____ the 2012 Olympic Games.

3. Some actors were c ___with taking drugs.

4. If you want to sell your product, you must ____     ( 做广)

5. I picked up a few good ____    ( 便宜货)in the sale.

关于外斐反应，下列哪一项是正确的（）

A.恙虫病患者血清可与变形杆菌Oxk发生凝集反应

B.最早可于第4病日出现阳性

C.第4周开始效价下降

D.一般凝集效价在1：160以上才有意义

E.可作为确诊依据