下列哪种襟翼产生增升效果好：（）A、后退式襟翼 B、前缘襟翼 C、富勒襟翼 D、开缝式襟翼
题型：单项选择题
问题：
下列哪种襟翼产生增升效果好：（）
A、后退式襟翼
B、前缘襟翼
C、富勒襟翼
D、开缝式襟翼
题型：单项选择题
阅读理解。
Dear Sandy,
How are you? It's Saturday today and I have some time to write to you. We're busy from Monday to
Friday. We have to get up at six thirty in the 
morning. After some exercise we have brea
kfast. We have
five classes a day and the first class begins at eight. Our teachers are strict and we can't be late for school.
They often ask us a lot of questions and some of them are difficult.
We do sports at five in the afternoon. We play basketball, soccer, volleyball, tennis or ping-pong.
Some of my classmates like Art. They can sing or dance or draw. Sometimes Miss White, our Biology
teacher, takes us to the zoo and we visit the animals there. At six we can leave our school.
After supper we can watch TV.
But we have to finish our homework first. I like Math and often do
some difficult exercises. So I go to bed at ten thirty. I'm often ti
red but I like it.
Please write to me 
and tell me about yourself.
Yours,
Zhang Hong
1. Zhang Hong is very busy _____.
A. from Monday to Friday
B. on Saturday
C. on Sunday
D. on Wednesday
2. Zhang Hong can sleep for _____ hours a day
A. six
B. seven
C. eight
D. nine
3. Miss White teaches _____ in Zhang Hong's school.
A. Biology
B. Math
C. Art
D. Music
4. The children have sports _____ .
A. in the afternoon
B. after school
C. in class
D. in the morning
5. Zhang Hong does some difficult Math exercises because _____ .
A. her teacher makes her do so
B. she has much time at home
C. she likes it
D. her teachers are strict