空域通常划分为（）。
A、机场飞行空域
B、航路、航线空域
C、空中禁区、空中限制区和空中危险区
D、已上全是
参考答案：D
What day was it yesterday [A] Sunday. [B] Tuesday. [C] Monday.
Which do you like ______ ,pandas, deer or rabbits? [ ]
A. better
B. best
C. well
D. much
