9999100×99+99.99
=99.99×99+99.99，
=（99+1）×99.99，
=100×99.99，
=9999．
— Did you enjoy yourself at the party?
— Yes. I've never been to _____ one before. [ ]
A. a more excited
B. the most excited
C. a more exciting
D. the most exciting
正常人平均步速约为（）
A.1.0m/s
B.1.2m/s
C.1.5m/s
D.1.8m/s
E.2.0m/s
