题干

静脉血经过图中B内的气体交换后变为动脉血,动脉血经过图中D内的气体交换后变为静脉血,B和D内的气体交换都是通过(    )而实现的.

A:呼吸运动

B:肺

C:气体扩散

D:呼吸系统

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答案(点此获取答案解析)

C

同类题2

阅读下列短文,根据短文信息完成文后表格,每空一词。

    Last year, I did not like my English class. Every class was like a bad dream. The teacher spoke very quickly and I couldn't understand her most of the time. I was afraid to ask questions because I didn't know how to read the words correctly. I just hid behind my textbook and never said anything in class.

     Then one day I watched an English movie—Toy Story. I fell in love with this exciting and funny movie. So I began to watch other English movies, too. Although(尽管)  I understood I could get the meaning by listening for just the key words. I found out that listening to something interesting is the secret to the language learning. I also learned some useful sentences like “It's a piece of cake”or “It serves you right. I did not understand these at first. But because I wanted to understand the story, I looked them up in a dictionary(字典).

    Now I really enjoy my English class. Do you want to learn English like this?

How I learned English

Last year

I ____ my English class. It was like a bad dream.

The teacher spoke ____ quickly for me to understand most of the time.

I was afraid ____ asking questions because I couldn't read the words correctly.

I thought I had to ____ behind the textbooks and say nothing in class.

Then

Everything changed after I watched an exciting and funny movie ____ Toy story. Although I could not understand everything the characters said, I tried to get the ____ in many ways.

   ※Watching their ____ languages and expressions on their faces

   ※ Listening for just the ____ words.

   ※____ a dictionary for help helped me understand the story.

My id ea

Listening to something ____ is the secret to language learning.