单项选择题

A．The lifecycle of trees.
B．The number of trees.
C．The intensity of solar burning.
D．The quality of air.
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单项选择题
A．Playing the guitar.B．Working at a restaurant.C．Singing in a rock concert.D．Dancing in a ballet recital.
A．Playing the guitar.
B．Working at a restaurant.
C．Singing in a rock concert.
D．Dancing in a ballet recital.
单项选择题
A．The industrialization of the United States.B．The development of individual timepieces.C．Reasons for increased productivity.D．How wristwatches are manufactured.
A．The industrialization of the United States.
B．The development of individual timepieces.
C．Reasons for increased productivity.
D．How wristwatches are manufactured.
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