问题 选择题

在人体进行呼吸的过程中,通过a可以实现肺的通气,通过b可以完成肺的换气。这里的a和b分别是指(  )

A.a呼吸运动,b血液循环

B.a气体扩散,b血液循环

C.a膈肌运动,b肋间肌运动

D.a呼吸运动,b气体扩散

答案

答案:D

题目分析:肺的换气是指肺泡与血液间进行气体交换.当血液流经肺部毛细血管时,肺泡中氧的浓度最高,血液中二氧化碳浓度低,这时发生了扩散作用.血液中的二氧化碳扩散进入肺泡,肺泡中的氧扩散进入血液.这样血液由含氧少的静脉血变成含氧丰富的动脉血;气体扩散是指某种气体分子通过扩散运动而进入到其它气体里;因为气体分子的不规则运动比较激烈,所以扩散比较明显.气体交换是通过气体的扩散作用来完成的,一种气体总是由多的地方向少的地方扩散,直到平衡为止.因此肺泡内的气体交换和组织里的换气都是通过是通过气体扩散完成的。故选:D.

阅读理解

阅读理解。

    What is your favorite color? Ask famous persons like Cate Blanchett, Scarlett Johnson, and Bono (singer

for the band U2), and maybe they will say "green." That's not because these artists like the color green best.

Instead, they are interested in green fashion.

    Green fashion is about making (and wearing) clothes that are good for humans, animals, and the Earth.

In the past, green fashion made people think of ugly clothes. But today, green fashion is different. It is about

looking good and caring about the Earth and other people. You can have interesting clothes and be green.

    Around the world, green fashion is becoming popular. For example, the U.K. company People Tree sells

men's and women's clothing and accessories (配搭物). They are made from natural fabrics (织物) like

cotton and wool. Workers who make the clothes are from countries like Kenya (肯尼亚), and Bangladesh

(孟加拉国). People Tree pays the men and women good money for the clothes they make.

     Singer Bono and his wife also started a clothing company called EDUN. When the clothes sell, EDUN

uses most of the money to help people around the world.

1. From this passage, we know that "green fashion" means ______. [ ]

A. putting green color on your face

B. making clothes from green trees

C. wearing the color green all the time

D. wearing clothes that are good for the Earth

2. Today, green fashion is ______. [ ]

A. the same as it was in the past

B. making people work harder

C. more popular and interesting

D. mostly popular with famous persons

3. Which sentence about green clothing companies is true? [ ]

A. They are all in Africa.

B. They do not pay their workers well.

C. They make clothes only for women.

D. They use natural fabrics to make clothes.

4. What does EDUN do? [ ]

A. It teaches people to make clothes.

B. It makes interesting clothes for teenagers.

C. It sells clothes and uses the money to help people.

D. It pays people good money for the clothes they make.

单项选择题