问题 解答题

制作洋葱鳞片叶内表皮细胞临时装片

【准备】

(1)用洁净的纱布将______和______搽拭干净.

(2)将载玻片放在实验台上,用______在载玻片的中央滴一滴______.

【制作临时装片】

(1)用镊子从洋葱鳞片叶内侧撕取一小块透明薄膜---______.把撕下的结构浸入载玻片上的水滴中,并用镊子将它______.

(2)用镊子夹起盖玻片,使它的一边先接触载玻片上的水滴,然后______放下,盖在要观察的洋葱内表皮上,避免盖玻片下出现______.

【染色】

(1)把一滴______滴在盖玻片的一侧.

(2)用吸水纸从盖玻片的另一侧______,使稀碘液浸润标本的全部.

答案

制作洋葱表皮细胞临时装片的实验步骤简单的总结为:擦、滴、撕、展、盖、染.

【准备】(1)“擦”,用干净的纱布把载玻片和盖玻片擦拭干净;

(2)“滴”,把载玻片放在实验台上,用滴管在载玻片的中央滴一滴清水;

【制作临时装片】

(1)“撕”,把洋葱鳞片叶向外折断,用镊子从洋葱鳞片叶的内表面撕取一块薄膜,即洋葱鳞片叶;

“展”,把撕取的薄膜放在载玻片中央的水滴中,用解剖针轻轻的把水滴中的薄膜展开;

(2)“盖“,用镊子夹起盖玻片,使它的一端先接触载玻片上的液滴,然后缓缓放平,防止出现气泡;

【染色】

(1)“染”,在盖玻片的一侧滴加碘液.

(2)用吸水纸从盖玻片的另一侧吸引,重复2~3次,使染液浸润到标本的全部.

故答案为:【准备】

(1)盖玻片;载玻片.

(2)滴管;清水.

【制作临时装片】

(1)洋葱鳞片叶;展开.

(2)缓缓;气泡.

【染色】

(1)碘液.

(2)吸引.

阅读理解

B: 阅读下面短文,从每题所给的三个选项(A、B和C)中,选出最佳选项。

If you’re ready to add more physical activity(体育运动) to your life, here are some tips(建议).

Make physical activity part of your routine, like brushing your teeth or going to work. Try biking to work at least once a week, using the stairs more often, or walking to some places near home. But talk to your doctor before you start an exercise routine, especially if you haven’t been very active or have health problems.

Walking is one of the best fitness(健康) activities. To keep up a routine, you can walk with family members, friends or pets. Count your steps with a step counter(计数器). You can buy one at a sporting goods store. If you don’t have time for one 30-minute walk, break it into three 10-minute walks.

Find an activity that you enjoy, and stay with it. Change it with other activities so you don’t get bored. For example, walk three days a week, and swim or bike on the other days. Join a volleyball or basketball club for fun and exercise. By finding more activities you enjoy, you’ll have a greater chance for success.

小题1:The underlined word “routine” probably means “______” in Chinese.

A. 建议                 B. 惯例                 C. 爱好

小题2:What does the writer suggest doing before starting daily exercise?

A. Talking to the doctor.      

B. Walking to work.       

C. Buying a step counter.

小题3:How many tips does the writer mention when talking about the walking activity?

A. Two.                     B. Three.               C. Four.

小题4:To avoid getting bored with the same activity, we can ______.

A. break one 30-minute walk into three

B. change the activity we are staying with

C. do the activity with our family members

小题5:The passage mainly talks about ______.

A. the ways to count walking steps

B. some health problems we may face

C. some advice on physical activity

多项选择题