单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．It helps people get up early.
B．It produces Vitamin D.
C．It kills cold viruses.
D．It enables us to look healthy.
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单项选择题
A．To live a more comfortable life.B．To give performances.C．To be a pupil of a famous violinist.D．To enter a famous university.
A．To live a more comfortable life.
B．To give performances.
C．To be a pupil of a famous violinist.
D．To enter a famous university.
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