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.
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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.
单项选择题
A．She was asked to call the chairman’s wife.B．She was asked to make a copy of English final exam.C．She was asked to go to the chairman’s wife’s office.D．She 4vas asked to retake the final exam.
A．She was asked to call the chairman’s wife.
B．She was asked to make a copy of English final exam.
C．She was asked to go to the chairman’s wife’s office.
D．She 4vas asked to retake the final exam.
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