单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．People’s health.
B．The end of the world.
C．People’s lives and futures.
D．The Great Depression of 1929.
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单项选择题
A．They defend the bone against viruses.B．They break down bone tissue.C．They prevent oxygen from entering the bone.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They break down bone tissue.
C．They prevent oxygen from entering the bone.
D．They connect the bone to muscle tissue.
单项选择题
A．On short trips.B．When flying over cities.C．On long trips.D．When flying at high altitude.
A．On short trips.
B．When flying over cities.
C．On long trips.
D．When flying at high altitude.
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