欲测定植物是否进行光反应,可以检测是否有() A.葡萄糖的生成 B.淀粉的生成 C.O2的释放 D.CO2的吸收 答案:CSitting on a chair all day in
school can make anyone want to move around. So, more and more teachers are
letting students have a ball. By sitting on exercise balls instead of chairs,
teachers find students' posture (姿势) and
attention improve.
Dottie Pownall, a fifth-grade
teacher in West Virginia, USA, has been using balls as chairs since December
2008. "The students love them", she says. Pownall took a survey of
her students. She found that 80% of the students thought sitting on the balls
helped them pay more attention to what they were learning.
The teacher, Pisa Witt, felt so
strongly about the use of balls as chairs, she started Witt Fitt. This company
encourages the use of the balls. And the company educates not only teachers but
also students on how to use them. "Our products are used in 24 states,
three provinces in Canada, Puerto Rico ('波多黎各) and Japan," says Witt. "Research
shows that sitting on the balls makes them sit up straighter. You can slouch (低头垂肩地坐) on a ball," says Witt, "but it feels awful."
Because the students are moving, their blood (血液) increases. That carries more oxygen (氧气 to
the brain (大脑), so the kids have more energy and can
focus longer.
"Furthermore, they're
fun." says Pownali.
1. What will happen if a student sits on a
chair all day in school? The student will _________.
A. pay more attention to his
lessons B.
be fun
C. like to move
around
D. sit up straighter
2. How long has Dottie Pownall used the balls?
A. About three years. B.
Only one year.
C. In 2008. D.
Since he was a fifth-grade teacher.
3. In how many countries are the balls used as
the students' chairs?
A. Four. B.
Three. C. Two. D.
One.
4.Teachers choose balls instead of chairs
because sitting on balls helps the kids___________.
A. improve the students' posture
and attention B. slouch on the
chairs
C. have fun
D. Both A and C are correct answers.
5.Which is better for kids to study in class,
sitting on a chair or sitting on a ball?
A. Sitting on a chair.
B. Sitting on a ball.
C. They are the
same. D. We don't know.