Đường sức từ là gì?

Từ phổ là gì?

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

I would rather you wore something more formal to work.

A. I'd prefer you wearing something more formal to work

B. I'd prefer you should wear something more formal to work

C. I'd prefer you to wear something more formal to work

D. I'd prefer you wear something more formal to work

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

She asked why did Mathew look so embarrassed when he saw Carole.

A. why 

B. did Mathew look

C. so embarrassed

D. saw 

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Higher education is very importance to national economies and it is also a source of trained and educated personnel for the whole country

A. importance 

B. economies

C. educated

D. the whole country

45mm+55mm......10cm

Dấu cần điền vào chỗ trống là

Hỗn hợp X gồm hai axit cacboxylic đơn chức, đồng đẳng kế tiếp. Cho 5,4 gam X phản ứng hoàn toàn với dung dịch NaHCO₃ dư, thu được 2,24 lít khí CO₂ (đktc). Công thức của hai axit trong X là

A. C₃H₇COOH và C₄H₉COOH.

B. CH₃COOH và C₂H₅COOH.

C. C₂H₅COOH và C₃H₇COOH

D. HCOOH và CH₃COOH

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSET in meaning to the underlined word(s) in each of the following question.

 In order to better understand English, the students incorporated gramar, vocabulary, and speaking in their stidies.

A. Combined

 B. granted

C. scrutinized

D. skipped