被灭活的病毒不能保留的特性是（）
A.抗原性
B.红细胞吸附性
C.感染性
D.血凝性
E.细胞融合
参考答案：C
作文（40分）
请以“温暖心灵”为题目，自选角度，写一篇600字左右的记叙文。
What is an advantage of using foam in fire fighting?（）
A.It is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)
B.Most foams can be used with dry chemicals to attack a fire by two methods
C.Foam is effective on combustible metal fires
D.Foam can be made with seawater or fresh water
