A：The teacher just canceled the test.
老师刚刚取消了考试。
B：Are you kidding?
你在开玩笑吗?S
注释：
a.cancel vt. 取消
We're going to cancel the meeting because of a typhoon.
= We' re going to call off the meeting because of a typhoon...
(因为台风的关系，我们将取消会议。)
b. Are you kidding?
= Are you kidding me?
= Are you joking?
(你在开玩笑吗?)
但不可说：
Are you joking me? (×)