Cho biết: Nguyên tố Đồng vị . Phát biểu nào sau đây là sai?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.

The prices of vegetables at the market fluctuate daily depending on supply and demand.

She warned that her dog was aggressive towards strangers.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 37 to 41.

She always walks around with her nose in the air, thinking she’s better than anyone else.

Hai Phong will restrict car access to Cat Ba Island during the Reunification Day and Labor Day holiday to prevent congestion at a ferry port.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 18 to 22.