每单位血液采集后必须在实验室检测，通常包括：（）
A.筛选是否有传染源的存在
B.血型鉴定
C.血常规检测
D.血肾功能检测
参考答案：A, B
用括号里所给词的适当形式填。每空一词。
小题1:When did your sister get _________(marry)?
小题2:Air _________（pollute）has become a serious problem.
小题3:The song “Memory” has been popular since the_________(twenty) century.
小题4:It’s _________(bore) to see the same channel.
小题5:Our classroom is at the _________(south) end of our school.
小题6:Bob loves water sports, such as swimming and _________(sail).
城市生态系统的特征有（）、（）、（）、（）。
