问题 选择题

化石在地层中显示,在越早形成的地层中形成化石的生物(  )

A.结构越简单低等

B.结构越简单高等

C.结构越复杂低等

D.结构越复杂高等

答案

化石是保存在地层中的古代生物的遗体、遗物或生活痕迹.研究发现,不同的地层中埋藏着不同类型的生物化石:埋藏于较浅地层中的化石与现代生物结构比较相似,埋藏于较深地层中的化石与现代生物结构差别较大,并且越是古老的地层中发掘的生物化石结构越简单、低等,水生生物的化石越多;越是晚期的地层中发掘的生物化石结构越复杂、高等,陆生生物化石越多.这说明生物进化的趋势是:从简单到复杂,由低等到高等,从水生到陆生.所以化石记录显示,在越早形成的地层里形成化石的生物越简单、低等,水生的越多.

故选A.

阅读理解

阅读理解。

     Lily has a penfriend in America. Her name is Alice. They write to each other every week. They tell each

other about their lives. Here is a letter from Lily.

Dear Alice,

    Thank you for your letter and telling me about your best friend.In this letter,I'm going to tell you about my

friend.Her name is Cathy. She has long brown hair and blue eyes. She is the same age as me,but a little taller.

She is always happy. We sit together in class and help each other with our homework. We always play

together after school and play computer games for an hour. Cathy thinks quickly (迅速地) and does better

than me. She is learning to play the piano (钢琴).I am learning to play the piano,too.We play together every

day. It's fun. We always have a good time.

     Please write to me soon. 

                                                                                                                                                   Love, 

                                                                                                                                                   Lily

1. How often does Lily write to Alice? [ ]

A. Every two weeks.

B. Every week.

C. Every day.

D. Every three weeks.

2. Who is Lily's best friend? [ ]

A. She doesn't have one.

B. Cathy.

C. Alice.

D. Tommy.

3. What is Cathy's hair like? [ ]

A. Long and green.

B. Long and brown.

C. Short and brown.

D. Short and black.

4. When do they play computer games? [ ]

A. Before school.

B. At school.

C. After school.

D. At the weekend.

5. What other things do they do together every day? [ ]

A. Write letters.

B. Sing.

C. Play the piano.

D. Use the computer.

判断题