When can the deficiency of vitamin B12 cause problems?

Questões de assuntos semelhantes

• The main purpose of the text is to 
• In the last paragraph (lines 105-114), the author suggests that
• According to the text, Ingeborg Rapoport was not awarded her PhD back in 1937 because:
• It can be inferred from the text that smoking can affect the following aspects of students’ lives:
• “Cut it out!”. What does this sentence mean?