影响百度关键词质量度的因素包括（）。
A.用户体验
B.点击率
C.信用度
D.网页容积
参考答案：A, B, C
句型转换。
1. It was Wednesday yesterday. (对画线部分提问)
was it yesterday?
2. He was a doctor 10 years ago. (对画线部分提问)
he 10 years ago?
3. I was at the birthday party last night. (对画线部分提问)
at the birthday party last night?
4. Five years later,he became a teacher. (对画线部分提问)
he a teacher?
5. The space flight lasted 15 hours. (对画线部分提问)
the space flight ?
石油中毒引发的精神病，其恢复时间（）。
A、很长
B、短期
C、终生
