题干
Beijing, the capital of China, is one of cities in the world.
A：the biggest
B：Bigger
C：much bigger
D：big
答案(点此获取答案解析）
A
Beijing, the capital of China, is one of cities in the world.
A：the biggest
B：Bigger
C：much bigger
D：big
中，
，
，则k的值为（）