“固定无偿献血者”定义是什么？
参考答案：至少献过3次血，且近12个月内献血至少1次。
一个正方形手帕的周长是12分米，它的边长是______分米．
— Andy, you were the only person that was late for the meeting, why?
— Sorry, sir. But I really had a _____ time finding the meeting hall. [ ]
A. enjoyable
B. funny
C. difficult
D. pleasant
