Để khử hoàn toàn 35,2 gam hỗn hợp gồm Fe, FeO, Fe₃O₄, Fe₂O₃ cần vừa đủ 7,28 lít khí CO (đktc). Khối lượng sắt thu được là:Để khử hoàn toàn 35,2 gam hỗn hợp gồm Fe, FeO, Fe₃O₄, Fe₂O₃ cần vừa đủ 7,28 lít khí CO (đktc). Khối lượng sắt thu được là:

A. 31 gam.

B. 34 gam.

C. 32 gam.

D. 30 gam.

Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions. 

Fiberscopes have also found varied uses in industry, particularly to inspect or control operations in inaccessible areas

A. difficult to find

B. extremely small

C. hard to reach

D. hard to reach

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 46 to 64.

It is a __________.

A. blue sleeping polyester bag 

B. blue polyester sleeping bag

C. sleeping blue polyester bag 

D. polyester blue bag

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 46 to 64.

Does Mr. Ba bring his farm __________ to the local market everyday?

A. produce 

B. productivity 

C. product 

D. production