单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．Help them with their studies.
B．Employ them as lab assistants.
C．Teach classes at their high school.
D．Pay them for participating in the study.
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单项选择题
A．Because their number is growing and they are more active.B．Because senior citizens have more experience than others.C．Because their average life span is longer.D．Because they do more work now.
A．Because their number is growing and they are more active.
B．Because senior citizens have more experience than others.
C．Because their average life span is longer.
D．Because they do more work now.
单项选择题
A．Your physical health.B．Your emotional health.C．Your muscle strength.D．Your blood pressure.
A．Your physical health.
B．Your emotional health.
C．Your muscle strength.
D．Your blood pressure.
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