阅读小天地，根据文内容判断下列句子的正(√)误(×)。

      Lily and Lucy are classmates. They're in the same class. Lily is from the U. K. and Lucy is from the U. S. 

      Lucy usually walks to school. Her home is not far from school. She arrives at school at 8: 00 from Monday

to Friday. She likes to play the piano. 

      Lily usually goes to school by bus. But sometimes she rides her bike. She always has lunch at school,

because her home is far from school. She likes to play ping-pong. She usually plays ping-pong with her friends

after school.

( ) 1. Lucy and Lily are in different classes.

( ) 2. Lucy's home is far from school.

( ) 3. Lily usually goes to school by bike.

( ) 4. Lucy likes to play the piano.

( ) 5. Lucy and Lily are from the U. S.

在一项宫颈癌与口服避孕药关系的
队列研究中，发现口服避孕药的女性宫颈癌的发病率为350.0/10万，而没有口服避孕药的发病率为70.0/10万：女性宫颈癌的发病率为125.0/10万。根据此资料计算

归因危险度百分比为

A．60.0%

B．70.0%

C．80.0%

D．90.0%

E．无法计算