Công thức nào sau đây là của xenlulozơ?

A .   [ C 6 H 7 O 2 ( O H ) 3 ] n .

B .   [ C 6 H 8 O 2 ( O H ) 3 ] n

C .   [ C 6 H 7 O 3 ( O H ) 3 ] n

D .   [ C 6 H 5 O 2 ( O H ) 3 ] n

Read the reading below, say whether the statements are true (T) or false (F). (Write T or F at the end of the statement.)

   HELPING MORTHER AT HOME

Every child should love his mother. A girl or boy learns’ many good things from mother. Mother teachers us to be obedient, helpful and friendly to others.

Ever since my young days I have always helped my mother in the kitchen. I get up early in the morning and help my mother prepare breakfast. Then I clean the kitchen and sweep the floor. I also help mother wash the post and pans.

On Sunday I follow my mother to the market and help her to carry vegetables and fish back home. Some times my mother asks me to cut vegetables. I readily do I wash vegetables. I like to give small help whenever I am free from school work.

One day when my mother was sick, I cooked dishes for lunch. My mother is always happy and tells me that I should be good to everyone.

Every mother will be happy if her children help her at home.

She gets up late and does nothing in the morning. ____