Ⅰ型变态反应迟发相的炎症介质有（）。
A.白三烯
B.血小板活化因子
C.前列腺素D2
D.组胺
参考答案：A, B, C
-----Did you watch the basketball match yesterday?
-----Yes, I did. You know, my brother ________ in the match.
A．is playing
B．was playing
C．has played
D．had played
蒸青绿茶
