题干
A: What did she do? B: She ______.
A：dance
B：dancer
C：danced
答案(点此获取答案解析）
C
A: What did she do? B: She ______.
A：dance
B：dancer
C：danced
图象如图乙，则电压表内阻Rv及电源电动势E为（ ）
