问题 读图填空题

在一块淀粉—琼脂块上的五个圆点位置,分别用不同方法处理,如图所示:将上述实验装置放入37℃恒温箱中,保温处理24小时后,用碘液浸淀粉—琼脂块,其实验结果记录于下表:

圆点位置实验处理方法碘液处理后

的颜色反应

A新鲜唾液与盐酸混合蓝黑色
B经过煮沸的新鲜唾液蓝黑色
C只有新鲜唾液红棕色
D接种酵母菌红棕色
E只有2%蔗糖酶液
⑴ 你对圆点A与B的颜色变化的解释是                     

⑵ 圆点D的颜色变化与圆点C具有一致性,你对这种实验结果的解释是              

⑶ 你认为圆点E应呈现    色,你做出这种判断的理由是蔗糖酶                   

⑷ 上述实验装置要放入37℃恒温箱中进行保温处理,目的是                    

⑸ 该实验的对照组是       

答案

淀粉没有被消化,淀粉遇碘变蓝  酵母菌能分解淀粉 蓝黑色 不能消化淀粉 模拟人体的正常体温  C

淀粉遇到碘液变蓝,碘液是用来检验淀粉的存在,A与B滴加碘液变蓝,说明了淀粉仍存在,唾液没有对淀粉进行消化,C与D处加碘液不变蓝,说明淀粉被消化了 ,蔗糖酶液不能对淀粉消化,所有淀粉存在,滴加碘液为蓝黑色,其中C为对照组,其它为实验组。

填空题

Have you had a headache during a test Have you ever been so worried about something that you have a headache or even can’t sleep at night If so, then you know what stress is. Stress is what you feel when you are worried about something. This worry in your mind can make your body feel bad. You may feel angry, sad, scared, or afraid—all of which can give you a stomachache or a headache.
However, there are different kinds of stress. Some kinds of stress are good and others are bad. Good stress might happen when you’re called to answer questions in class or when you have to give a speech. This kind of stress can help you to get things better done. For example, you may do a better job on your test if the stress pushes you to prepare better before the test.
On the other hand, bad stress can happen if stress lasts too long. You may not feel well if your parents are fighting, if a family member is sick, if you’re having problems at school, or if anything else makes you unhappy every day. That kind of stress isn’t going to help you. And it can actually make you sick.
The best way to fight stress is to have a balanced life. Make sure you keep your SELF in mind: Sleep, Exercise, Leisure(休闲), and Food. If you get enough sleep and eat properly, and if you exercise and leave time for fun, you’ll probably feel less stressed.

Title: Face the Stress
Meaning of stressStress is a (68) when you are worried about something.
Possible effectYou may feel uncomfortable in your (69) and body.

Good stress

· It might happen when you have to (70) in public.

· It will be more (71) for you to do the job successfully.

· It makes you (72) better before doing the job.

Different kindsBad stress

· It might happen if your stress (73) too long.

· You may not feel well with the (74) of a family member, problems at school or something else that worries you every day.

· It might stop you from getting your work well done.

How to keep stress (75) 

Have a balanced life.

· Have enough sleep and have (76) food.

· Take exercise and have time to (77) yourself.


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