问题 选择题

用显微镜的一个目镜分别与4个不同倍数的物镜组合观察临时装片,形成清晰物像时,每一物镜与载玻片的距离如下图示。在一个视野中看到的细胞数目最多的是

答案

答案:D

题目分析:显微镜的放大倍数越大,视野就越小,看到的细胞体积就越大,但数目越少;显微镜的放大倍数越小,视野就越大,看到的细胞就越小,但细胞的数目越多物镜离载玻片越远放大倍数越小,目镜的话是越长放大倍数越小。

点评:有关显微镜使用方面的题很重要.要想做好此类题目,一定要多动手,多思考,熟能生巧。

阅读理解

阅读理解。

     I'm Tessa, 18 years old now. I remember my time at primary school well. I feel some of it is really

good, but some of it can bring back bad memories.

     My first day

     I'll never forget my first day at primary school. I remember I felt really nervous on that day. We were

in assembly (集合), and the head teacher was introducing himself. A girl next to me started asking about my shoes. So, I told her about my shoes. Suddenly the head teacher looked at me with an angry face. "

Be quiet when I am speaking! Go and stand in the corner," he said. I remember I felt so terrible at that

time.

     My first teacher

     I remember her name was Mrs Simpson. She was really pretty and had a lovely smile. She had a soft

voice and always wore the same sweater. She seemed so nice after that horrible (可怕的) head teacher.

     Sports day

     The sports day was the best day of school! I used to practice for the five-kilometer race and one year

I actually won!

     My nickname (绰号)

     Everyone in the class had a nickname. Some of the nicknames were funny and some weren't very

nice. There was a thin girl who everyone called "spider legs". I remember they used to call me "mushroom

(蘑菇) head" because my hair stuck out (突出) on either side. It made a lasting impression on me. Not a good one.

1. The underlined phrase "bring back" means  "________  " in Chinese.

A. 归还      

B. 归来        

C. 恢复      

D. 使想起

2. Why did the head teacher make Tessa stand in the corner?

A. Because she failed a test.

B. Because she was the tallest.  

C. Because she talked with the girl next to her.  

D. Because she didn't listen carefully in class.

3. What did Tessa think of her head teacher?

A. Nice.                    

B. Impolite.

C. Horrible.                  

D. Funny.

4. Tessa's classmates called her "mushroom head" because of _________.

A. her shoes  

B. her hairstyle

C. her thin legs              

D. her funny face

5. Which of the following is NOT true?

A. Tessa thinks her nickname is not a good one.

B. Tessa's first teacher was very nice and kind.

C. Tessa mainly tells us something about her primary school memories.

D. Tessa's first day at primary school was wonderful because she made a new friend.

多项选择题