单项选择题

It has been _________ years since Galileo made the first telescope.

A．more than 390
B．over 350
C．about 1609
D．more than 30
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单项选择题
In a landscape scene, two-thirds of the picture should be _________.
A．land
B．sky
C．clouds
D．sea
单项选择题
In the first example, the subject is probably a _________.
A．building
B．tree
C．horse
D．girl
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