单项选择题

What does the passage mainly discuss

A．European influence on American portraits.
B．Portraits in the 19th century America.
C．Art in the 19th century America.
D．The development of photography.

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单项选择题

What does the example of Babylonia astronomers reveal

A．It reveals Babylonians' wisdom that was absent elsewhere.
B．It reveals the origin of our time measurements.
C．It reveals the limits of some time measurements.
D．It reveals the stability of time measurements.