镜片处方为+0.50-2.50×20，标称棱镜度为2.00△，其垂直向允差为（）△。
A、0.25
B、0.35
C、0.45
D、0.55
参考答案：B
人类意识和动物的心理活动共同具有的反射活动的形式是 ( )
A．无条件反射
B．一切条件反射
C．第二信号系统
D．一切反射活动
句型转换。
1. I have lunch at school. (改为否定句)
I ______ ______ ______ at school.
2. Lessons start at 8: 00. (对画线部分提问)
______ ______ ______ lessons start?
3. It is Thursday today. (对画线部分提问)
______ ______ is it today?
4. We have three lessons in the morning. (对划线部分提问)
______ ______ lessons ______ you have in the morning?
5. We finish our lessons at five. (改为同意句)
______ ______ at five.
lunc
h at school. (改为否定句)
______ ______ lessons start? 