旅游团队出发前，地陪应至少提前( )到达旅游者下榻的饭店，在约定的位置上等候旅游者。
A．5分钟
B．10分钟
C．15分钟
D．20分钟
参考答案：D
嗜酸性粒细胞在速发型超敏反应的作用是
A．释放IL-4B．以上均错C．清除杀伤变应原D．合成IgEE．合成组胺
用所给单词的适当形式填空。
1. Thank you for ______ (give) me the present.
2. Look! They _______ (talk) about their school trip.
3. Gina and Tina _______(not have) lunch now.
4. Do you want _______(go) to the zoo with me?
5. What _______ she ________(do) now?
