单项选择题

Sulphur has occasionally been found in the earth in an almost pure state.

A．regularly
B．accidentally
C．sometimes
D．successfully
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单项选择题
When visiting museums nowadays, people can take part in many activities.
A． Right
B． Wrong
C． Not mentioned
单项选择题
New York’s American Museum of Natural History is opened recently.
A． Right
B． Wrong
C． Not mentioned
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