Cho các chất sau: etyl axetat, glucozơ, saccarozơ, tinh bột, fructozơ. Số chất bị thủy phân trong môi trường axit là

A. 1.

B. 4.

C. 3.

D. 2.

Tơ có nguồn gốc xenlulozơ là

A. tơ tằm.

B. sợi bông.

C. tơ nilon -6,6.

D. tơ capron.

Chất nào sau đây không có phản ứng thủy phân?

A. Glucozo.

 B. Xenlulozo.

C. Saccarozo.

D. Tinh bột.

Kết quả thí nghiệm của các dung dịch X, Y, Z, T với thuốc thử được ghi ở bảng sau:

X, Y, Z, T lần lượt là:

A. anilin, tinh bột, axit glutamic, glucozơ.

B. axit glutamic, tinh bột, anilin, glucozơ.

C. anilin, axit glutamic, tinh bột, glucozơ.

D. axit glutamic, tinh bột, glucozơ, anilin.

Read the passage and answer the questions.

 The environment is senously polluted today. To protect the environment, we should reduce the plastic bags, bottles and cans. We should put the garbage in a certain place or in the recycling bins. Remember save and recycle paper so that we can avoid cutting a lot of trees in the forest. That means we can reduce the soil pollution. It would be better if we go to work or school by bike or walk, we can save energy and keep the air cleaner. Or we can reuse and recycle things. And we should not throw trash into the rivers and lakes to keep the water not polluted. Do these things we will protect the environment and we will live healthier life.

1. How is the environment today? => It is senously polluted today2. Where
should we put the garbage? => We should put the garbage in a certain place or in the recycling bins
3. Why must we save and recycle paper? => Because we can avoid cutting a lot of trees in the forest

4. Will we live healthier life if we keep the environment clean? => Yes, we will