阅读下面的短文，选择正确的答案。

      Mary is a student. She lives far from her school. So she often goes to school by bus. She gets up at 6: 30

every morning. She doesn't want to be late.

      The first class starts at eight and there are four classes in the morning and three in the afternoon. She

doesn't go home for lunch. She has lunch at school.

      Mary studies Chinese, English, math and other lessons at school. She studies hard.

      In the evening, she usually does her homework. Sometimes she watches TV. She goes to bed early.

1. How does Mary go to school?

2. Mary _____________ at 6: 30 every morning.

A. gets up

B. goes to school

C. goes home

3. Mary has lunch _____________.

A. at home

B. at school

C. in the park

4. Mary usually does her homework _____________.

A. in the morning

B. in the afternoon

C. in the evening

5. Does Mary go to bed early? 

A. No, she doesn't.

B. Yes, he does.

C. Yes, she does.

采光系数是指（）。

A.室内某一工作面的照度与室外开阔天空散射光照度的比值

B.室内某一工作面的照度与室外开阔天空散射光水平照度的比值

C.室内某一工作面的天然光照度与同时室外开阔天空散射光水平照度的比值

D.室内某一工作面的天然光照度与室内总照度（包括自然光与人工照明）的比值

E.室内某一工作面的人工光照度与室内总照度（包括自然光与人工照明）的比值