单项选择题

A．When a patient is at an old age.
B．When a patient is very young.
C．When a person doesn’t take foods containing vitamins.
D．When a patient stops vitamins injections.
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单项选择题
A．He wants to make an appointment.B．He wants to visit his friend.C．He wants to inquire about the car.D．He wants to invite his friend for a meal.
A．He wants to make an appointment.
B．He wants to visit his friend.
C．He wants to inquire about the car.
D．He wants to invite his friend for a meal.
单项选择题
A．Mother and father.B．Mother and son.C．Teacher and student.D．Two students.
A．Mother and father.
B．Mother and son.
C．Teacher and student.
D．Two students.
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