下列选项可以用来表征交流电压的是（）。
A.平均值
B.有效值
C.峰值
D.最大值
参考答案：A, B, C
选择适当的单词或短语填空。
1. Let's go to the ____________ (library; cinema) to see a film.
2. I'm ____________ (hungry; thirsty). Let's eat some noodles.
3. I want to go to the ____________ (restaurant; park) to fly kites.
4. I'll show you. ____________ (These; This) way, please.
下列药物中哪些药物的药用部位是果实（）
A.吴茱萸
B.小茴香
C.丁香
D.花椒
E.荜茇
