病原菌检验中所有标本都应做但比较费时的是（）
A.分离培养
B.直接涂片镜检
C.血清学试验
D.药敏试验
E.生化试验
参考答案：A
Women prefer to buy food which has already been prepared it reaches the market．
A．after
B．for
C．before
D．until
何其芳建国前的诗作收录于（）和《夜歌》中。
