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．People considered them essential.B．They were common in the United States, but not in Europe.C．Only a few people had them.D．They were actually not very accurate.
A．People considered them essential.
B．They were common in the United States, but not in Europe.
C．Only a few people had them.
D．They were actually not very accurate.
单项选择题
A．In a restaurant.B．In a book shop.C．In a record store.D．In a theater.
A．In a restaurant.
B．In a book shop.
C．In a record store.
D．In a theater.
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