题干
— Did Eric go swimming yesterday?
— _________. He went to the movies with Mark.
A：Yes, he did
B：Yes, he does
C：No, he didn't
D：No, he doesn't
答案(点此获取答案解析）
C
是自然对数的底数）当输入 
为3时，输出 
的值为（ ） 