单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Choose as many exercise programs as possible.
B．Start small and work gradually.
C．Have muscle strengthening exercises first.
D．Never choose exercise with high intensity.
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单项选择题
Why do we work only about half the time today as we did at the end of the 19th century
A．The world’s population has increased greatly.
B．The natural resources have drastically decreased.
C．Technology has made workload and housework reduced.
D．People understand the importance of getting relaxed.
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