单项选择题

A．A chemistry class.
B．A biology class.
C．A mathematics class.
D．A physics class.
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单项选择题
A．Alice is now in a very bad temper.B．Alice is now preparing for the test.C．Alice is now very happy.D．Alice is now ill.
A．Alice is now in a very bad temper.
B．Alice is now preparing for the test.
C．Alice is now very happy.
D．Alice is now ill.
单项选择题
A．$5B．$15C．$30D．$250
A．$5
B．$15
C．$30
D．$250
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